| Terms |
Definitions |
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average speed
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distance/Δt
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kinematics
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study of motion
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inference
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Conclusion based on observations
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Arcsec is
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a unit of Angle
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michelson interferometer: when the mirror is moved distance d, the distance traveled by the light changes by ___.
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2d
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__________ is sometimes called Thompson or classical scattering.
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Coherent
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planetesimals
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Small planetary objects that form through the action of gravity during the birth of a solar system
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cohesive forces
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the electromagnetic forces of attraction that like particles exert on one another; responsable for surface tension and viscosity
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Density
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Density= Mass/volumeAn object that is more dense that the fluid in which it's immersed sinks, and an object that is less dense than the fluid in which it's immersed floats.
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temperature
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measure of the average translational kinetic energy per molecule of a substance
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Conventional current
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The flow of positive charges.
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photoelectrons
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the electrons emitted in the photoelectric effect.
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Translucent
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materials that allow light to pass through
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None
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Which of the following end points is documented
well enough in the scientific literature to allow a
risk assessment for diagnostic ultrasound to be
based on it?
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Magnetic domains are
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Regions of atoms magnetically aligned
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where the boat actually wound up going
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Vbs
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Bernulli -
Inc velocity dec pressure-
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venturi effect
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Impulse
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Product of force multiplied by the time the force acts.
Ft=p
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the quantity that describes both how fast a body is moving and in what direction
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velocity
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relativity
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theories saying motion must be defined relative to reference frame, and space and time are relative
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Example of SB type is
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NGC1300 in Eridanus ("River")
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in inelastic collisions ____ applies
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ONLY conservation of momentum
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Theory
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a synthesis of a large body of information that encompasses well-tested and verified hypothesises about aspects of the natural world.
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Pure Science
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Knowledge for the sake of it
(how? why? what?)
ex. knowing the phases of the moon
*trivial knowledge*
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Scientific Notation
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shorthand form when working with big or small numbers
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Displacement
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Is a vector that points from an object's initial position to its final postion and has a magnitude that equals the shortest distance between the two positions.
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shock wave
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cone-shaped wave produced by an object moving at supersonic speed
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What is sensitomety?
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The relationship between the intensity of exposure of the film and the blackness after processing
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When an atom absorbes energy, an electron moves to a higher energy level and quickly emits radiation to return to it's lowest possible energy level
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Excited State
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mechanical advantage
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the ratio of resistance force to effort force
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Newton's Second Law
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The acceleration porduced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object
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What is the most abundent in the CNS?
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Glial cells
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lunar eclipse
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a full moon when Earth is directly between the moon and the sun
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What is the piezoelectric effect?
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describes the property of certain materials to create a voltage when mechanically deformed (squeezed)
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Transverse Waves
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vibrations take place at a right angle to the direction of energy transfer
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What is the order of receiver operations? (Hint: alphabetical order)
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Amplification, compensation, compression, demodulation, reject
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what is the voltage supplied to the radiology department called
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line voltage
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angular velocity
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the time rate of change of angular position of a rotating body, usually expressed in radians per second or radians per minute.
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current
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I = Q / t
I = current
Q = charge
t = time
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Describe what happens to the motion of a moving object when there is no resultant force acting on it.
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Nothing will happen.
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If a light ray is traveling from glass into air and meets this boundary at an angle of incidence of 36 degrees, which of the following is the angle of refraction
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B. 45 degrees
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What is the Nyquist limit if the PRF is 5 kHz
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2.5 kHz
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the measure of the amount of change a force produces when it acts on a body
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work
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What is passive solar heating?
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When something is heated by absorbing the suns solar energy.
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How are amplitude and power related?
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When power increases, so does amplitude.
When power decreases, so does amplitude.
power ∞ amplitude2
*(∞ = proportional, I couldn't find the real sign on here)
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What artifact appears as a single, solid hyperechoic line?
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Comet Tail or Ring Down
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triple point of water
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the temperature of water at which ice, liquid water, and water vapor coexist at thermal equilibrium, defined as 0.01°C or 273.15 K.
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What two observations of an object allow for a determination of the Milky Way's mass?
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an object's velocity and distance from the galactic center
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Amplitude depends on _____________ and it is able to ______________
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how it is generated (not speed); transfer energy (the greater the amplitude, the more energy)
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In soft tissue, a 4 MHz ultrasonic wave starts with an intensity of 8 watts/cm2. What is the total attenuation after traveling a depth of 10cm?
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total attenuation = 20 dB
*you must find attenuation coefficient first, then x distance
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When a skier moves down a ski slope...
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The skier's potential energy is decreasing
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Is the pressure of a fluid equal at any given depth?
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No, because additional pressure is exerted by the weight of the fluid above any given point
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place a compass in a magnetic field, the compass needle will
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line up in the direction parallel to the magnetic field lines
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