Chapter 24
Electromagnetic waves
o Changing magnetic fields create
electric fields.
o Changing electric fields create
magnetic fields.
o Here we have a sort of symmetry.
o Together, the electric and magnetic
fields acting together can produce a
traveling
1)
2)
3)
4)
5)
6)
1)
2)
3)
4)
5)
6)
Assignment Light A
Convert the following E/M waves.
a. 758 nm to frequency
b. 2.52 x 1012 Hz to wavelength
What is the intensity of a 60.0 W point source 1.25 m away?
What is the critical angle of light moving from wate
Lab Report
I. Introduction
A couple of sentences introducing
the lab and the main topic.
II. Procedure
Leave blank. (Simply indicate where
it would be.) (Needs to be more thorough on
the portfolio.)
III. Data
(Charts and graphs)
IV. Calculations (Need a s
Assignment Chapter 20
1) A current of 2.50 A flows through a circuit for 8.00 minutes. The current is supplied
by a 12.0 V battery. How much energy is used?
2) A total resistance of 12.0 is created when two resistors are placed into a circuit. If
one of t
Group Work Chap 18
1) How many electrons are required to create a charge of -2.00 x 10-14 C?
2) Find the Force between a charge of + 2.00 C and 2.50 C placed 1.25 m apart?
3) Find the net force acting on a +2.50 C charge placed at the origin from 3 equal
Assignment Light part B
1) What is the distance between first order maxima from an interference pattern from
two slits? The wavelength of light is 546 nm, the slit separation d is 0.120 mm, and
the slit-screen separation is 55 cm. (Hint: Assume is small a
Assignment Chapter 22
1) For a uniform Magnetic Field, what must be the angle between the Area vector and
the field to give of the maximum Magnetic Flux?
2) A coil of wire has 4 turns. A constant and uniform magnetic field of 2.40 T is
incident on this co
Equations
Kinematic equations
v = v0 + a t
x = x0 + (v0 + v) t
x = x0 + v0 t + a t2
v2 = v02 + 2 a Dx
vav = vconstant = Dx/t
Forces
F=ma
(S F = m a)
W = mg (weight)
Fr = m N (friction)
F = - k x (spring)
Fcp = m v2/r (centripetal)
acp= v2/r
Work and Energ
Chapter 19
* Electric Potential Energy
o Basics:
* Symbol: U
* Unit: Joule, J
* Scalar
o Electrostatic force is conservative.
o If a charge is placed in a constant E field, it will experience a Force.
*F=qE
* If that charge is moved, work will be done.
*
Magnetism
* Magnets
o Magnets have two sides.
o One side is called North, the other South.
o Opposite sides attract. N S
o Same sides repel. N N S S
o The Earth has a magnetic field.
* The North magnetic pole is actually a South pole.
* The South magnetic
Assignment Light A
1) Convert the following E/M waves.
a. 758 nm to frequency
b. 2.52 x 1012 Hz to wavelength
2) What is the intensity of a 60.0 W point source 1.25 m away?
3) What is the critical angle of light moving from water to air?
4) Light parallel
Electric Charge and Fields
* Electric Charge
o Electric charge like mass is a fundamental property of nature.
o Unlike mass, charge comes in 2 forms positive (+) and negative (-).
o Also, where gravity is always attractive; electric charge can be repulsiv
Chapter 24
* Electromagnetic waves
o Changing magnetic fields create electric fields.
o Changing electric fields create magnetic fields.
o Here we have a sort of symmetry.
o Together, the electric and magnetic fields acting together can produce a travelin
Des Moines Area Community College
General Physics II PHY 161 E1
Spring 2015
Instructor: Kevin Menges Office: Bldg. 4, Rm 18
Meeting Time: MW 6:00 9:00 PM Bldg. 4, Rm 03
Prerequisite: PHY 160 or instructors permission
Credit Hours: 5 CRN: 23289
Text Physic
v=f
p = U/c (absorbed light)
p = 2U/c (reflected light)
P (pressure) = I/c (absorbed light)
P (pressure) = 2 I/c (reflected light)
I = I0 cos
n = c/v
n1 sin 1 = n2 sin 2
Sin c = n2/n1
1/p + 1/i = 1/f
d sin = m (m = 0, 1, 2, 3,)
d sin = (m + )
a sin = m
Assignment Chap 23
1)
A 75.00 resistor, a 95.00 mH inductor, and a 55.00 F capacitor are connected
in series with an ac source with amplitude of 50.00 V.
a)
What is the natural angular frequency?
If the source frequency is 50.00 Hz:
b)
What is the driving
Assignment Chap 21
1)
A wire carrying 20.0 A has a length of 0.350 m. There is a uniform magnetic field
at 35 degrees to the wire of 0.0250 T. What is the magnetic force on the wire.
2)
A uniform magnetic field points up out of a plane. A rectangular loop
Chapter 23
Alternating Current
o Alternating current or ac for short
o Alternating current is energy
supplied by a current that oscillates
and changes direction.
o The frequency of oscillation in the
US is 60 Hz.
o What is the angular frequency in the
US?
Chapter 25/26
Reflection
o When a traveling E/M wave meets
an interface between 2 different
media, it may be reflected, refracted,
absorbed or a combination of all
three.
o Depends on:
Angle of incidence
Types of materials
Indexes of refraction
o Law o
Chapter 27
Wave/Ray
o Although we have treated light like a
ray or beam, it also has
characteristics of a wave.
o When two waves come together,
they will follow the principle of
superposition.
Superposition
o The net displacement of a
combination of waves
Chapter 22 Induction
Review:
1) There are connections between
magnetic and electric fields.
2) Moving charges create magnetic
fields.
Induced Emf
(Draw a picture of two circuits.
One (primary) is a switch, an Emf, a
resistor, and a coil. The other
(secon
Chapter 19
Electric Potential Energy
o Basics:
Symbol:
U
Unit: Joule, J
Scalar
o Electrostatic force is conservative.
o If a charge is placed in a constant E
field, it will experience a Force.
F=qE
If that charge is moved, work will
be done.
W=-qEd
Electric Charge and Fields
Electric Charge
o Electric charge like mass is a fundamental
property of nature.
o Unlike mass, charge comes in 2 forms positive
(+) and negative (-).
o Also, where gravity is always attractive; electric
charge can be repulsive
Chap 20
Electric Current
If we take 2 charged balls with different
charges and we connect a wire between the
balls, the electrons will be free to move from
one ball to the other ball.
This is electric current.
o Basics
Symbol:
I, i
Unit: Ampere, Amp, A
Magnetism
Magnets
o Magnets have two sides.
o One side is called North, the other
South.
o Opposite sides attract.
NS
o Same sides repel.
NN
SS
o The Earth has a magnetic field.
The North magnetic pole is
actually a South pole.
The South magnetic pole i
Assignment Chapter 20
1)
2)
3)
4)
5)
6)
7)
a)
d)
g)
j)
A current of 2.50 A flows through a circuit for 8.00 minutes. The current is
supplied by a 12.0 V battery. How much energy is used?
A total resistance of 12.0 is created when two resistors are placed
Assignment Chap 19
1)
Two charges of +0.250 mC are placed at the points (1.25 mm, 0 mm) and
(-1.25 mm, 0 mm). A third charge of -0.450 mC is placed at the origin. Find the potential
at a point P (0 mm, 1.25 mm)
2)
Find the potential energy required to put
Equations
Kinematic equations
v=v +at
x = x + (v + v) t
x = x + v t + a t2
v2 = v 2 + 2 a x
0
0
0
0
0
0
v =v
av
constant
= x/t
Forces
F=ma
( F = m a)
W = mg
Fr = N
F=-kx
Fcp = m v2/r
acp= v2/r
(weight)
(friction)
(spring)
(centripetal)
Work and Energy
W=F
v=f
p = U/c
(absorbed light)
p = 2U/c
(reflected light)
P (pressure) = I/c
(absorbed light)
P (pressure) = 2 I/c (reflected light)
I = I0 cos
n = c/v
n1 sin 1 = n2 sin 2
Sin c = n2/n1
1/p + 1/i = 1/f
d sin = m
(m = 0, 1, 2, 3,)
d sin = (m + )
a sin = m
Physics 161
Portfolio Guidelines
General
The portfolio is a collection of 4 items, not from any other assignment. They
demonstrate your understanding and progress with Physics concepts. One item must be a
biography of a Physicist. You chose the other 3 of