3C
Prof. Bullock
Exam A
Midterm
ID#_____________
1
MT (15, 4 pts each, 20 pts total).
For 15, write your answer (AF) IN THE BOXES below.
Only answers marked in the
appropriate box will
be graded.
Unreadable letters will be marked wrong.
IF YOU
LEAVE A BOX BLANK YOU WILL RECEIVE NO CREDIT FOR THE QUESTION.
Circled or marked letters below each problem
do not count
as answers.
1.
2.
3.
4.
5.
1. Xray waves have _______ and
________ than visible light waves?
a. longer wavelengths and propagate faster
b. shorter wavelengths and propagate slower
c. longer wavelengths and higher frequencies
d. shorter wavelengths and lower frequencies
e. longer wavelengths and lower frequencies
f. shorter wavelengths and higher frequencies
f.
2. The vertical height of a particle is given by the expression
y = (2.0 m) sin( 4.0
π
t + 3/5
π
)
where y is in m and t is in s.
What is the period of its motion?
a.
π
/4 s
b. 0.08 s
c. 0.5 s
d. 4.0 s
e. 4
π
s
f.
3/5
π
s
c.
ω
= 4
π
/s =
2
π
f
=> f = 2 Hz
and T = 1/f = 0.5 s
3. The particle discussed in the above problem is, in fact, one point along a very long
string.
The point is located at the position x=2m.
Which of the following equations
could describe a wave traveling along this string?
a. y(x,t) = (2.0m) sin (4.0
π
t + 3/5
π
x)
b. y(x,t) = (2.0m) sin (4.0
π
t + 2/5
π
x  2/5
π
)
c. y(x,t) = (2.0m) sin (3/5
π
x
 4.0
π
t +
π
)
d. y(x,t) = (2.0m) sin (3/5
π
x
 4.0
π
t )
e. y(x,t) = (2.0m) sin (4.0
π
t + 1/5
π
x + 1/5
π
)
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Prof. Bullock
Exam A
Midterm
ID#_____________
2
e.
y(x=2,t) = (2.0m) sin (4
π
t + 1/5
π
(2) + 1/5
π
) = (2.0m)sin(4
π
t + 3/5
π
)
4. Unpolarized light passes through two polaroid sheets. The axis of the first is vertical,
and that of the second is at 40.0° off of the vertical.
What fraction of the incident light
is transmitted?
a. not enough information given
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 Spring '08
 Wu
 Light, Frequency, Wavelength, Prof. Bullock Midterm

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