Chapter 26
Drop a rock in a pool of water. What do you see?
When we get far enough away from the source of the wave, it flattens out. We call this a
PLANE WAVE.
REFLECTION:
In geometrical optics, we imagine light as a ray or arrow. Of course, we know that
Chapter 27
THE HUMAN EYE:
1. The greatest refraction of light occurs at the air (n = 1.00) CORNEA ( n = 1.38 ) interface.
2. Secondary refraction occurs at the AQUEOUS HUMOR (n = 1.33) LENS (n = 1.40)
interface.
3. The shape of the LENS, and so its focal
ELECTROMAGNETIC WAVES:
In Physics I, we learned that there are two types of waves: longitudinal and transverse. EM
waves are the transverse type, meaning that the direction of the vibration or oscillation is at right
angles to the direction that its going
Chapter 23
Define: Magnetic Flux, = B A cos T m2 = 1 Weber (Wb)
Simply put, flux is a measure of how many B-field vectors pierce an open area times the
size of the area available to it, and also how strong those B-field vectors are. Imagine a
large thin h
Chapter 22
What is magnetism? It was named after the ancient city of Magnesia in Asia Minor.
Some 2000 years ago, the Greeks observed the properties of lodestone (its also found
in Lancaster, PA!) By the 12th century, the Chinese were using it as a compas
Chapter 21
Definition of electric current: I
Q C
1 Amp
t s
Current is simply charges in motion! (Mostly, but not ALWAYS, electrons).
Effects of current on the human body:
1 mA you can just feel it.
5 mA ouch!
10 mA causes involuntary muscle spasms
15 m
Chapter 20
Review gravitational/spring potential energy and conservative forces (U only depends
on the beginning/ending points) from last semester.
Example: If a rock is lifted in a gravitational field, its PE will increase. Why?
U = -W
W F d ( mgy) (dy)
19-21. When two identical ions are separated by a distance of 6.2 10 10 m, the
electrostatic force each exerts on the other is 5.4 10 9 N. How many electrons are
missing from each ion?
Picture the Problem: Two identical charged ions exert an electrostatic
30-27: You have two lightbulbs of different power and color, as indicated in Figure 30
21. One is a 150-W red bulb, and the other is a 25-W blue bulb. (a) Which bulb emits
more photons per second? (b) Which bulb emits photons of higher energy? (c) Calcula
29-43: An electron moves to the right in a laboratory accelerator with a speed of 0.84c.
A second electron in a different accelerator moves to the left with a speed of 0.43c
relative to the first electron. Find the speed of the second electron relative to
28-8. A microphone is located on the line connecting two speakers that are 0.845 m apart
and oscillating 180 out of phase. The microphone is 2.25 m from the midpoint of the
two speakers. What are the lowest two frequencies that produce an interference
max
26-32:
During a daytime football game you notice that a players reflective helmet forms an
image of the Sun 4.8 cm behind the surface of the helmet. What is the radius of curvature
of the helmet, assuming it to be roughly spherical?
Picture the Problem: T
26-93:
The focal length of a lens is inversely proportional to the quantity (n 1), where n is the
index of refraction of the lens material. The value of n, however, depends on the
wavelength of the light that passes through the lens. For example, one type
25-50 IP Electromagnetic wave 1 has a maximum electric field of E 0 52 V / m, and
.
electromagnetic wave 2 has a maximum magnetic field of B0 15 T. (a) Which wave has
the greater intensity? (b) Calculate the intensity of each wave.
Picture the Problem: Tw
24-6
A 75-watt lightbulb uses an average power of 75 W when connected to an rms voltage of 120 V. (a)
What is the resistance of the lightbulb? (b) What is the maximum current in the bulb? (c) What is the
maximum power used by the bulb at any given instant
Chapter 28
SUPERPOSITION AND INTERFERENCE:
For (b), which peak is which? They all look the same.
1. Addition of ordinates when adding two waves their y-coordinates (amplitudes) add together
at every point to produce a new wave.
2. IN PHASE means that the
CHAPTER 30
Ideal blackbody: absorbs all light that is incident on it. My grandparents coal furnace. Objects
that absorb well also emit (radiate) well. The color of the emitted ratiation will change as the
object is heated.
Which is hotter? Red hot or blue
Physics 102
FORM 0
[l] Two point charges of +60.0 [J,C and -12.0 /C are separated by a distance of 40.0 cm. A + 7.00 /xC charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
Physics 102
FORM 0
[l] What is the focal length of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters? _ [A] 8.0 cm [B] 5.6 cm [C] 6.0 cm ([Dp.S cm [E] 4.0 cm [2] A little known fact is that both Robinson Crusoe and Friday wore ey
Physics 102
FORM 0
[1] Positively charged particles, moving horizontally along the northward direction with a distribution of velocities, enter a region of space where both an electric and a magnetic field are present. These particles are to be selected a
Physics 102
FORM 0
[1] Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process (assuming that no mass was exch
ED4
11.
COM
- PR
EME
D41
P
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
EME
D41
1.C
OM
- PR
E
MED
411
.CO
MPRE
MED
411
.CO
M
ED4
11.
COM
- PR
EME
D41
P
1.C
OM
- PR
EME
PRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
M
ED4
11.
COM
- PR
EM
ED4
11.
COM
P
PRE
MED
411
.CO
MPRE
MED
411
PRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
M
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
P
PRE
MED
PRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
MED
411
.CO
MPRE
M
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
- PR
EM
ED4
11.
COM
P
PRE
MED