Practice Questions
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| 1. |
Which
of the following exhibit simple harmonic motion? |
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I. A pendulum
II. A mass attached to a spring
III. A ball bouncing up and down, in the absence of friction
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| (A) |
I only |
| (B) |
II only |
| (C) |
III only |
| (D) |
I and II only |
| (E) |
I, II, and III |
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| 2. |
If
a wave has frequency  Hz and speed v =
100 m/s, what is its wavelength? |
| (A) |
 m |
| (B) |
 m |
| (C) |
 m |
| (D) |
 m |
| (E) |
 m |
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| 3. |
Two
strings of equal length are stretched out with equal tension. The
second string is four times as massive as the first string. If a
wave travels down the first string with velocity v,
how fast does a wave travel down the second string? |
| (A) |
 v |
| (B) |
 v |
| (C) |
v |
| (D) |
2v |
| (E) |
4v |
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| 4. |
A
piano tuner has a tuning fork that sounds with a frequency of 250
Hz. The tuner strikes the fork and plays a key that sounds with
a frequency of 200 Hz. What is the frequency of the beats that the piano
tuner hears? |
| (A) |
0 Hz |
| (B) |
0.8 Hz |
| (C) |
1.25 Hz |
| (D) |
50 Hz |
| (E) |
450 Hz |
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| 5. |
How
is the lowest resonant frequency,  , for a tube with one closed end related
to the lowest resonant frequency,  , for a tube with no closed ends? |
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
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| 6. |
Two pulses travel along a string
toward each other, as depicted above. Which of the following diagrams
represents the pulses on the string at a later time? |
| (A) |
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| (B) |
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| (C) |
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| (D) |
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| (E) |
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| 7. |
What
should a piano tuner do to correct the sound of a string that is
flat, that is, it plays at a lower pitch than it should? |
| (A) |
Tighten the string to make the fundamental frequency higher |
| (B) |
Tighten the string to make the fundamental frequency lower |
| (C) |
Loosen the string to make the fundamental frequency higher |
| (D) |
Loosen the string to make the fundamental frequency lower |
| (E) |
Find a harmonic closer to the desired pitch |
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| 10. |
An
ambulance driving with velocity  where  is the speed of sound, emits a siren with
a frequency of  . What
is the frequency heard by a stationary observer toward whom the
ambulance is driving? |
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
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toward a person standing on a street
corner. As the car approaches, the person hears the sound at a frequency
of 
. Take the speed
of sound to be v.
