| Terms |
Definitions |
|
vibration
|
oscillation
|
|
liquids and gases
|
fluids
|
|
quantum
|
called a photon
|
|
atomic number
|
number of protons
|
|
any push or pull
|
force
|
|
atomic number
|
number of protons
|
|
tritium
|
unstable radioactive isotop of hydrogen whose atom has a proton two neutrons and an electron
|
|
generator-
|
machine that produces electric current, usually by rotating a coil within a stationary magnetic field
|
|
volt
|
SI unit of electric potential
|
|
gamma ray-
|
high frewuency electromagnetic radiation emitted by atomic nuclei
|
|
sound
|
longitudinal wave phenomenon that consists of successive compressions and rarefaction of the medium through which the wave travels
|
|
What is the lightest element
|
hydrogen
|
|
ultrasonic
|
term applied to sound frequencies above 20,000 hertz the normal upper limit of human hearing
|
|
Planck's Constant
|
fundamental constant of quantum theory that determines the scale of the small scale world plancks constant multiplied by the frequency of radiation gives the energy of a photon of that radiation
|
|
potential difference
|
difference in electric potential between two points free charge flows when there is a differen and will continue until both points reach a common potential
|
|
Atom
|
- smallest particle of an element
|
|
Alternating Current:
|
Electric current that rapidly reverses in direction. The electric charges vibrate about relatively fixed positions usually at the rate of 60 hertz
|
|
transformer
|
device for increasing or decreasing or decreasing voltage
|
|
solid
|
phase of matter characterized bu definite shape and volume
|
|
_______ = force/ area of application
|
pressure
|
|
the diagonal of the rectangel described by the two vectors
|
resultant
|
|
nucleon
|
principal building block of the nucleus a neutron or a proton the collectice name for either or both
|
|
thermometer
|
device used to meausre temperature usually in degrees celsius F or K
|
|
neutron
|
electrically neutral particle that is one of the two kinds of nucleons that compose an atomic nucleus
|
|
cyclotron-
|
particle accelerator that imparts high energy to charged particals such as protons, deuterons and helium ions
|
|
An objects acceleration is proportional to its
|
net force
|
|
Fuse-
|
device in an electric circuit that breaks the circuit when the current gets high enough to risk causing fire
|
|
voltage
|
electrical pressure or a measure of electrical ptenotail difference
|
|
longitudinal wave -
|
wave in which the individual particles of a medium vibrate back and forth in the direction in which the wave travels (sound)
|
|
Absolute zero-
|
lowest possible temperature that any substance can have; the temp. at which the atoms of a substance have their minimum kinestic energy. The temp. of absolute zero is -273.15 C which is -459.7 F and 0 K
|
|
conductor-
|
material through which heat can be transferred material usually a metal through which electric charge can flow good conductors of heat are generally good electric charge conductors
|
|
Acoustics-
|
study of the properties of sound, especially its transmission
|
|
diffraction-
|
bending of light that passes around an obstacle or through a narrow slit, causing the light to spread and to produce light and dark fringes
|
|
Element-
|
substance composed of atoms that all have the same atomic number and therefore the same chemical properties
|
|
electromagnetic spectrum-
|
range of frequencies over which electromagnetic radiation can be propogated. The lowest frew. Are associated with radio waves, microwaves have a higher freq. and then infrared waves light ultraviolet radiation, X rays, and gamma rays in sequence
|
|
electrodynamics-
|
study of moving electric charge, as opposed to electrostatics
|
|
electric current-
|
flow of electric charges that transports energy from one place to another, Measured in ameperes, where one ampere is the flow of 6.25 10^18 electrons per second
|
|
rarefaction
|
region of reduced pressure in a longitudianl wave
|
|
transmutation
|
conversion of an atomic nucleus of one element into an atoamic nucleus of another element through a loss or gain the number of protons
|
|
total distance covered divided by time
|
average speed
|
|
________ ~ 1/mass
|
acceleration is inversely proportional to mass
|
|
________ is directly proportional to net force
|
ACCELERATION~net force
|
|
a quantity that is completely described by magnitude only
|
scalar quantity
|
|
Frequency-
|
the number of vibrations or wave crests per unit of time. HERTZ
|
|
Fuse-
|
device in an electric circuit that breaks the circuit when the current gets high enough to risk causing fire
|
|
transparent
|
term applied to materials that allow lght to pass through them in straight lines
|
|
opaque
|
term applied to material that absorb light withotu reemission and consequently do not allow light through them
|
|
chain reaction-
|
self sustaining reaction that, once started steadily provides the energy and matter necessary to continue the reaction
|
|
boiling-
|
change from liquid to gas occurring beneath the surface of the liquid; rapid vaporization. The liquid loses energy the gas gains it
|
|
What is force
|
a push or a pull
|
|
Kelvin scale-
|
temp scale, measured in kelvins K, whose zero is the temp at which it is impossible to extract any more internal energy from a material 0K= -273.15 C there are no negative temp. on the K scale
|
|
magnetic field-
|
region of magnetic influence around a magnetic pole or a moving charged particle
|
|
radiotherapy
|
use of radiation as a treatment to kill cancer cells
|
|
reflection
|
reutrn of light rays from a surface in sich a way that the angle at whcih a given ray is tretuend is equal to the angle at whic it strikes the surface
|
|
electromagnetic radiation-
|
transfer of energy by the rapid oscillations of electromagnetic fields, which travel in the form of waves called electromagnetic waves
|
|
circuit breaker-
|
device in an electric circuit that breaks the circuit when the current gets high enough to risk causing a fire
|
|
parallel circuit
|
electric circuit with two or more devices connected in such a way that the same voltage acts across each one and ay single one completes the circuit independetly of the others
|
|
liquid-
|
phase of matter between the solid and gaseous phases in which the matter possesses a definite colume but no definite shape it takes on the shape of its container
|
|
When no horizontal _______ acts on a projectile, the horizontal velocity remains constant
|
force
|
|
The ______ the angle of support ropes or wire from the vertical, the larger the tension force in them
|
greater
|
|
Celsius scale-
|
temperature scale that assigns 0 to the melt freeze point for water and 100 to the boil-condense point of water at standard pressure
|
|
oscillation
|
same as vibration a repeating to and fro motion about an equilibrium position both oscillation and vibration refer to periodic motion that is mption that repeats
|
|
circuit breaker-
|
device in an electric circuit that breaks the circuit when the current gets high enough to risk causing a fire
|
|
convection-
|
means of heat transfer by movement of heated substances itself such as by currents in a fluid.
|
|
direct current
|
-electric current whose flow of charge is always in one direction
|
|
electric field-
|
force filed that fills the space around every electric charge or group of charges
|
|
electromagnetic radiation-
|
transfer of energy by the rapid oscillations of electromagnetic fields, which travel in the form of waves called electromagnetic waves
|
|
strong force
|
force that attracts nucleons to each other within the nucleus a force that is very strong at close distancesbut decreases rapidly as the distance increatses strong interaction
|
|
Freezing-
|
change in phse from liquid to solid the opposite of melting
|
|
radiotherapy
|
use of radiation as a treatment to kill cancer cells
|
|
what is the most abundant element
|
hydrogen, almost 90%
|
|
Define mixture
|
a substance whos components are mixed together without chemically combining
|
|
condensation-
|
change of phase of a gas into a liquid,
|
|
atomic mass
|
the average of the masses of the exisintg istopes of an element
|
|
wave
|
a wiggle in space and time a REGULAR DISTURBANCE that repeats regularly in sace and time and that is trasmitted progressively from on place to the next with no net transport of matter
|
|
electrical resistance-
|
resistance of a material to the flow of electric charge through it measure in ohms
|
|
1 newton per square meter is equal to one _________
|
pascal
|
|
condensation-
|
change of phase of a gas into a liquid,
|
|
evaporation-
|
change of phase from ;iquid to a gas that takes place at the surface of a liquid the opposite of condensation
|
|
radiant energy
|
any energy including heat light and x rays that is trasnmitted by radiation it occurs in the form of electromagnetic waves
|
|
Antinode-
|
any part of a standing wave with max. displacement and max energy
|
|
shock wave
|
cone shaped wave prodiced nu am object moving at supersonic speed through a fliod
|
|
What is inertia
|
the property of things to resist change in motion
|
|
Where did Eratosthenes learn that the sun is directly overhead at the summer solstice in Syene?
|
from library information
|
|
Define Hookes law
|
the amount of stretch or compression of an elastic material is directly proportional to the applied force; F ~change in x. When the spring constant k is introduced, F = k changein x
|
|
Bernoullis principle
|
when the speed of a fluid increases the internal pressure in the fluid decreases
|
|
Define density
|
the mass of a substance per unit volume
density = mass/volume
|
|
Principle of flotation
|
a floating object dispalces a weight of fluid equal to its own weight
|
|
Fahrenheit scale-
|
temp scale in common use in the US the number 23 is assigned to the melt freeze point of water, and the number 212 to the boil condense point of water at standard pressure
|
|
Angle of Incidence
|
- Angle between the incidence ray and the normal to the surface it encounters
|
|
Angle of Incidence
|
- Angle between the incidence ray and the normal to the surface it encounters
|
|
Angle of reflection-
|
“ “ between the reflected ray and the normal to the surface of reflection
|
|
ion-
|
atom with a net charge which is due to the loss or gain of electrons a positive ion has a net
|
|
Define atomic bonding
|
the linking of atoms to form larger structures
|
|
define buoyant force
|
the net upward force that a fluid exerts on an immersed object
|
|
electric potential energy
|
- energy a charge has due to its locations in an electric field
|
|
sound barrier
|
the pile up of sound waves in front of an aircraft approaching or reaching the speed of sound, believed in the early days of jet aircraft to create a barried of soujn that a plane would have to break throuhg in order to go faster than the speed of sound the sound barried does not exist (waves still pile up but no barrier to stop it)
|
|
What is quantum mechanics
|
theory of the small scale world that includes predicated wave properties of matter
|
|
What is a law?
|
when a hypothesis has been tested over and over again and has not been contradicted
|
|
What is a scientific theory
|
a synthesis of a large body of information taht encompasses well-tested and verified hypothesis about certain aspects of the natural world
|
|
What is mechanical equilibrium
|
no change in motion. Ex. if a rest, stays at rest; if moving, continues moving without change
|
|
What is a vector quantity?
|
a quantity such as force taht has both magnitude and direction
|
|
Are we accelerating if we are moving in a curved path at a constant speed?
|
Yes, because we are changing direction and thus our velocity is changing
|
|
quantum
|
called a photon
|
|
an educated guess
|
hypothesis
|
|
photon
|
QUANTA PACKET OF ENERGY
|
|
Ampere:
|
unit of electric current
|
|
Ampere:
|
unit of electric current
|
|
cyclotron-
|
particle accelerator that imparts high energy to charged particals such as protons, deuterons and helium ions
|
|
noise
|
scientifically speaking, sound that sorresponds to an irregular vibration of the eardrum produced by some irregular vibration which appears on an oscilloscope as an irregular pattern
|
|
convex mirror-
|
mirror that curves outward
|
|
speed in a given direction
|
velocity
|
|
hertz (Hz)-
|
SI unit of frequency
|
|
noise
|
scientifically speaking, sound that sorresponds to an irregular vibration of the eardrum produced by some irregular vibration which appears on an oscilloscope as an irregular pattern
|
|
radiation
|
energy transmitted by electromagnetic waves the particles given off by radioactive atoms such as uranium do not confuse radionat with radioactivity
|
|
mass number
|
the number of nucleons
|
|
microwaves
|
electromagnetic waves with grequencies greater than radio waves buyt less than infrared waves
|
|
laser-
|
optical instrument that produces a beam of coherent light that is light with all wves of the same frequency phase and direction. The word is an acronym for light amplification by stimulated emission of radiation
|
|
ionization-
|
process of adding or reoving electrons to or from the atomic nucleus
|
|
wave speed
|
WAVELENGTH * FREQ= WAVE SPEED
|
|
Galvanometer-
|
instrument used to detect electric current
|
|
beta particle-
|
electron emitted during radioactive decay of certain nuclei
|
|
resistor
|
device in an electric circiot designed to resist the flow of charge
|
|
neutron
|
electrically neutral particle that is one of the two kinds of nucleons that compose an atomic nucleus
|
|
thermometer
|
device used to meausre temperature usually in degrees celsius F or K
|
|
the veritical component of a projectile changes with time due to ________
|
gravity
|
|
Science and technology are _______ enterprises
|
human
|
|
potential difference
|
difference in electric potential between two points free charge flows when there is a differen and will continue until both points reach a common potential
|
|
solid
|
phase of matter characterized bu definite shape and volume
|
|
electricity-
|
general term for electrical phenomena much like gravity has to do wit gravitations phenomena or sociology with social phenomena
|
|
Galvanometer-
|
instrument used to detect electric current
|
|
beta particle-
|
electron emitted during radioactive decay of certain nuclei
|
|
Barometer
|
any device that measures atmospheric pressure
|
|
Velocity means
|
how fast and what direction
|
|
heat-
|
the energy fthat flows from one object to another by virtue of a difference in temp. measured in calories or joules
|
|
magnetic domain
|
microscopic cluster of atoms with their magnetic fields aligned
|
|
pitch
|
term that refers to our subjective impression about the highness or the lowness of a tone, whoch is related to the frequency of the tone a high vibrating source produces a sound of high pitch...low produces low
|
|
boiling-
|
change from liquid to gas occurring beneath the surface of the liquid; rapid vaporization. The liquid loses energy the gas gains it
|
|
Frequency-
|
the number of vibrations or wave crests per unit of time. HERTZ
|
|
quantum mechanics
|
concerned witht he atomic microworld based on wave functions and probabilities introduced by max planck and developed by heisenberg erwin schrodinger and others
|
|
the friction acting on something moving through air
|
air resistance
|
|
falling objects only affected by gravity
|
free falling
|
|
elementary particles-
|
subatomic particles the basic building blocks of all matter consisting of two classes or particles the quarks and the leptons
|
|
electrode-
|
terminal for example of a battery through which electric current can pass
|
|
critical mass-
|
minimum mass of fissionable material in a nuclear reactor or nuclear bomb that will sustain a chain reaction. A subcritical mass is one in which the cahin reaction dies out. A supercritical mass is one in which the chaine reaction builds up explosively
|
|
electric current-
|
flow of electric charges that transports energy from one place to another, Measured in ameperes, where one ampere is the flow of 6.25 10^18 electrons per second
|
|
nuclear fission
|
splitting of an atomic nucleus particularly that od a heavy element such as uranium 235 into two ligher elements accompanied by the relase of much energy
|
|
rarefaction
|
region of reduced pressure in a longitudianl wave
|
|
Atmospheric pressure
|
the pressure exerted against bodies immersed in the atmosphere. It results from the weight of air pressing down from above. At sea level, atmospheric pressure is about 101 kPa
|
|
Define compound
|
atoms of different elements are chemically bonded
|
|
insulator
|
- material that is a porr conductor of hear that is a poor conductor of electricity
|
|
kilowatt-hour-
|
amount of energy consumed in 1 hour at the rate of 1 kilowatt
|
|
refraction
|
bending of an oblique ray of light when it passes from one transparent medium to another difference i speed of light in the transparent
|
|
crest-
|
part of a wave where the disturbance is highest at greates
|
|
de Broglie matter waves-
|
all particles have wave properties
|
|
magnetic force
|
- between magnets, it is the attraction of unlike magnetic poles for each other and the repulsion between like magnetic poles. Between a magnetic field, and a moving charged particle, it is a deflecting force due to the motion of the particle: The deflecting force is perpendicular to the magnetic field line sna dhte firection of motion. This force is greatest when the charged particle moves perpendicular to the field lines and is smallest when it moves parallel to the field lines
|
|
transverse wave
|
wave with vibration at right angles to the direction the wave is traveling light consists of transverse waves
|
|
destructive interference-
|
combination of waves so that crest parts of one wave overlap trough parts of another, resulting in a wave of decreased amplitude
|
|
charging by induction-
|
redistribution of electric charges in and on objects cause by the electrical influence of a charged object close by but not in contact
|
|
A method that is extremeley effective in gaining, organizing, and applying new knowledge
|
scientific method
|
|
the amount of force per unit of area
|
pressure
|
|
the ________ component of motion for a projectile is completely independent of the vertical component of motion
|
horizontal
|
|
isotopes-
|
atoms where nuclei have the same numer of protons but different amount of neutrons
|
|
radioactive
|
term applied to an atom having an unstable nuclues that can spontaneously emit a particle and become the nucleus of an other elemt
|
|
longitudinal wave -
|
wave in which the individual particles of a medium vibrate back and forth in the direction in which the wave travels (sound)
|
|
liquid-
|
phase of matter between the solid and gaseous phases in which the matter possesses a definite colume but no definite shape it takes on the shape of its container
|
|
parallel circuit
|
electric circuit with two or more devices connected in such a way that the same voltage acts across each one and ay single one completes the circuit independetly of the others
|
|
charging by contact-
|
transfer of electric charge between objects by rubbing or simple touching
|
|
destructive interference-
|
combination of waves so that crest parts of one wave overlap trough parts of another, resulting in a wave of decreased amplitude
|
|
normal
|
at right angles to or perpendicular to a normal force acts at right angles to the surface on which it acts in optics, a normla defines the line perpendicular to a surface about which angles of light rays are measured
|
|
Kelvin scale-
|
temp scale, measured in kelvins K, whose zero is the temp at which it is impossible to extract any more internal energy from a material 0K= -273.15 C there are no negative temp. on the K scale
|
|
heat-
|
the energy fthat flows from one object to another by virtue of a difference in temp. measured in calories or joules
|
|
diffraction-
|
bending of light that passes around an obstacle or through a narrow slit, causing the light to spread and to produce light and dark fringes
|
|
Free fall acceleration is approximately equal to/
|
10 meters per second
|
|
If you know both speed and direction of an object, we know it's ________
|
velocity
|
|
If you double net force, then you _____ acceleration
|
double
|
|
Define element
|
a pure substance consisting of only one kind of atom
|
|
ion-
|
atom with a net charge which is due to the loss or gain of electrons a positive ion has a net
|
|
electromagnetic induction-
|
phenomenon of inducing a voltage in a conductor by changing the magnetic field near the conductor. If the magnetic field within a closed loop changes in any way, a voltage is induced in the loop. Te induction of voltage is actually the result of a more fundamental phenomenon: the induction of an electric field
|
|
Doppler effect-
|
change in frequency of a wave of sound or light due to the motion of the source or the receiver. Red shift blue shift
|
|
transuranic element
|
elemtn with an atomic number above 92 which is the atomic number of uranium all MAN MADE AFTER
|
|
half-life-
|
time required for half the atoms of a radioactive isotope of an element to decay.
|
|
combination of all forces acting on an object
|
net force
|
|
an object with a curved path of motion consisting of a horizontal and vertical component
|
projectile
|
|
crest-
|
part of a ave where the disturbance is highest at greates
|
|
compression (in sound)-
|
in sound the region of increased pressure in a longitudinal wave
|
|
calorie-
|
unit of heat. One calorie is the heat required to raise the temp of one gram of water 1 celsius degree. Once calorie with a capital C is equal to one thousand calories and is the unit used in describing the energy available from food also kilocalorie
|
|
half-life-
|
time required for half the atoms of a radioactive isotope of an element to decay.
|
|
reflection
|
reutrn of light rays from a surface in sich a way that the angle at whcih a given ray is tretuend is equal to the angle at whic it strikes the surface
|
|
watt
|
SI unite of power one watt is expended when one joule of work is done in one second
|
|
What is a vector quantity
|
it has magnitude and direction
|
|
what is an atom
|
tiny building block; smallest particle of an element that has all of the elements chemical properties
|
|
What is average speed
|
average speed = total distance covered/time interval
|
|
Define isotopes
|
different forms of atoms that have the same # of protons but different # of neutrons
|
|
Define dark matter
|
unseen and unidentified matter that is evident by its gravitational pull on stars in the galaxies. consitutes 90% of the stuff in the universe
|
|
In the absence of net forces a moving object tends to move along a __________ path indefinitely
|
straight-line
|
|
sound barrier
|
the pile up of sound waves in front of an aircraft approaching or reaching the speed of sound, believed in the early days of jet aircraft to create a barried of soujn that a plane would have to break throuhg in order to go faster than the speed of sound the sound barried does not exist (waves still pile up but no barrier to stop it)
|
|
magnetic pole-
|
one of the regions on a magnet that produces magnetic forces
|
|
heat of vaporization-
|
amount of energy that must be added to a kilogram of a liquid to vaporize it
|
|
electric potential energy
|
- energy a charge has due to its locations in an electric field
|
|
Define Atomic nucleus
|
the ocre of an atom, has protons and neutrons
|
|
What 5 elements are living things composed of ?
|
oxygen, carbon, hydrogen, nitrogen, calcium
|
|
What sign do downward and upward velocities have?
|
downward velocities are negative and upward velocities are positive
|
|
point at which the air resistance on an object equals the weight of the feather, the net force is zero and no further acceleration occurs
|
terminal speed or terminal velocity for falling objects
|
|
How do you calculate the total distance traveled?
|
total distance covered = average speed x time
|
|
What is the equilibrium rule
|
for any object or system of objects in equilibrium the sum of forces acting equlas zero
|
|
F
|
P * A
|
|
Earth's diameter iis
|
8,000 miles
|
|
Electromagnetic waves are
|
transverse waves
|
|
Electromagnetic waves are
|
Chapter 27 Light
|
|
system
|
a defined collection of objects
|
|
Newton
|
unit used to measure force
|
|
wave
|
a progressive disturbance propagated in a medium without progress or advance by the points themselves, as in the transmission of sound or light
|
|
What do you use seconds for?
|
Time
|
|
Electromagnet
|
many wire loops around unmagnetized iron/steel rod.
Current magnetizes iron
Result is much stronger magnet than that current alone
|
|
acceleration
|
The rate at which velocity changes
|
|
___________is a key factor in controling OD
|
mAs
|
|
wavelength
|
the distance, measured in the direction of propagation of a wave, between two successive points in the wave that are characterized by the same phase of oscillation.
|
|
Pascal
|
Force, which is measured in newtons, is differnet form pressure which is measured in newtons per square meter (Pa)
|
|
Which groove separates the temporal lobe from all other lobes?
|
Lateral Sulcus
|
|
THE DAMPING MATERIAL IN A TRANSDUCER DECREASES THE BANDWIDTH.
T OR F
|
FALSE
|
|
If the upward direction is positive, during the flight of a projectile, the acceleration on the object is:
positive
negative
positive then negative
negative then positive
|
negative
|
|
light –
|
Electromagnetic radiation that has a wavelength in the range from about 4,000 (violet) to about 7,700 (red) angstroms and may be perceived by the normal unaided human eye.
|
|
nuclear fusion
|
combining of nuclei of lght atoms
|
|
The electric field produced by a positive charge is directed _________ from the charge.
|
away
|
|
viscosity
|
the state or quality of being viscous.
|
|
What is the international standard still defined by an object stored under controlled conditions in an International Bureau of Standards location?
|
The kilogram
|
|
Nonconservative Force
|
A force, such as friction, that performs work over a distance that is dependent on the path taken between the initial and final positions
|
|
extrapolation
|
the estension of a graphed line beyond the region in which data was taken
|
|
Free Fall
|
motion under influence of only the force of gravity and nothing else.
|
|
Capacitance
|
The ratio of an object's stored charge to its electric potential difference
|
|
Currently the value of the Hubble constant is thought to be very close to...
|
70 km/s/Mpc
|
|
Which solution can be affected by even the smallest amount of temperature change?
|
Developer
|
|
What is the attenuation coefficient of 1 MHz US in soft tissue?
|
5 dB/cm
|
|
the relationship of the voltage output to voltage input in an autotransformer is what
|
autotransformer law
|
|
inertia
|
the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force
|
|
inelastic collision
|
a collision between objects in which the kinetic energy changes, for example, due to deformation or frictional loss.
|
|
Gill Arches Skeletal
|
Elements supporting the gill slits in nonvertebrate chordates and some vertebrates
|
|
Controlled Experiment
|
experiments are usually set up as a controlled experiment
|
|
net force
|
The combination of all the force that act on an object.
|
|
The current through a 12 ohm resistor connected to a 220V power supply is______
|
10 amps
|
|
The stage of the manufacturing process in which colored dyes are added to match the wavelengths of light photons is the:
|
The mixing stage
|
|
what is the consequence of having film stored at a temperature that is lower than recommended
|
static artifact
|
|
A chemical compound always contains exactly the same proportion of elements by mass
|
Law of Definite composition
|
|
ampere (A)
|
the SI unit of measurement of current; equivalent to C/s.
|
|
coefficient of kinetic friction
|
slope of line between two surfaces, relating frictional force to normal force
|
|
Great axial resolution is associated with
______ spatial pulse length
______ pulse duration
______ frequencies
_________ wavelength
________ cycles
_______ ringing
_________ numerical value
|
shorter spatial pulse length
shorter pulse duration
high frequency
short wavelength
few cycles
less ringing
lower numerical value
|
|
When something falls to the ground, it accelerates.This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of Earth's surface?
|
about 10 m/s^2
|
|
When something falls to the ground, it accelerates.This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of Earth's surface?
|
Chapter 2 Linear Motion
|
|
patient dose and variable kvp
|
higher dose and less exposure latitiude
|
|
uncertainty principle
|
the statement that, due to the laws of quantum mechanics, it is impossible to simultaneously exactly measure a particle's position and momentum or to exactly measure a particle's energy for a finite amount of time.
|
|
The shortest plane mirror in which you can see your entire image
|
Is half your height
|
|
Newton hypothesized that the moon
|
is a projectile, is falling around Earth, has tangential velocity that prevents it from falling into Earth, is actually attracted to Earth
|
|
Newton hypothesized that the moon
|
Chapter 12 Universal Gravitation
|
|
What is the frequency and voltage range for an EMG
|
high voltage, up to 10,000hz
|
|
The primary purpose of a grid is to:
|
decrease scatter reaching the receptor
|
|
An object travles 2 meters in the first second of travel, 2 meters again during the second second of travel, and 2 meters again during the third second. It's acceleration is:
|
0/it is staying the same
|
|
Gauss's Law for magnetic fields
|
We can't enclose a net pole within a surface, and is the mathematical statement that magnetic field lines form closed loops, they don't start or stop, which is why there are no magnetic monopoles.
|
|
How does a sequential array work?
|
5-10 elements are fired at exactly the same time and the sound wavelets combine to form one beam. Then the next group is fired
|
|
Put these in decreasing order of impedence:
matching layer, PZT, skin, gel
|
PZT > matching layer > gel > skin
|
|
What are U-Values and how do we calculate them?
|
Architects can work out the heat lost from a building using U-values and a formulae.
Heat lost/Second =
U-Value x Area x Temperature difference
Temperature difference =
Temperature inside the house - Temperature outside the house.
|
|
Pressure in liquids formula
|
P p x g x h
P- pressure p-density g-gravity h-height
triangle
|
