The velocity of sound in glycerol is 1.904 m/s. Find the bulk modulus (in N/m2) of glycerol if its density is 1.261 x 103 kg/m3. Select the correct answer.

1
The velocity of sound in glycerol is 1.904 m/s.
Find the bulk modulus (in N/m2) of glycerol if
its density is 1.261 x 103 kg/m3. Select the
correct answer.

1. 4.6 x 109
2. 4.5 x 109
3. 4.8 x 109
4. 4.9 x 109
5. 5.0 x 109

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2
The Young's modulus for lead is 1.52 x 1010 N/m2.
If the speed of sound in lead is measured to
be1.32 km/s, find its density (in kg/m3).
Select the correct answer.

1. 8.72 x 103
2. 9.02 x 103
3. 8.12 x 103
4. 35.2 x 103
5. 34.5 x 103

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3
A jet plane has a sound level of 140dB. What is
the intensity in W/m2? Select the correct
answer.

1. 100
2. 10
3. 1
4. 1.000
5. 10.000

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4
By what factor will the noise intensity change
when sound levels increases by 3 dB? Select
the correct answer.

1. 2.0
2. 0.3
3. 4
4. 1
5. 3

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5
When you hear the horn of a car that is
approaching you, the frequency that you hear is
higher than that heard by a person in the car
because _____ . Select the correct answer.

1. wavecrests are farther apart by the distance the
   car travels in one period
2. wavecrests are closer together by the distance
   the car travels in one period
3. the car gets ahead of each wavecrest before it
   emits the next one
4. the speed of sound in air is increased by the
   speed of the car
5. a speeding car emits more wavecrests in each
   period

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6
A car approaches a stationary police car at
32m/s. The frequency of the siren (relative to
the police car) is 500 Hz. What is the frequency
(in Hz) heard by an observer in the moving car as
he approaches the police car? (Assume the
velocity of sound in air is 343 m/s.) Select
the correct answer.

1. 547
2. 5.359
3. 593
4. 616
5. 639

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7
A car moving at 36 m/s passes a stationary police
car whose siren has a frequency of 400 Hz. What
is the change in the frequency (in Hz) heard by
an observer in the moving car as he passes the
police car? (The speed of sound in air is 343
m/s.) Select the correct answer.

1. 84
2. 145
3. 122
4. 42
5. 168

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8
A point source emits sound with a power output of
640.0 watts. What is the intensity (in W/m2) at a
distance of 40.0 m from the source? Select the
correct answer.

1. 3.18 x 10-2
2. 3.18 x 10-3
3. 3.18 x 10-4
4. 3.18 x 10-5
5. 3.18 x 102

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9
A truck moving at 28 m/s passes a police car
moving at 44 m/s in the opposite direction. If
the frequency of the siren relative to the police
car is 600 Hz, what is the frequency heard by an
observer in the truck after the police car passes
the truck? (The speed of sound in air is 343
m/s.) Select the correct answer.

1. 488
2. 465
3. 454
4. 521
5. 977

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10
A sculptor strikes a piece of marble with a
hammer. Find the speed of sound through the
marble (in km/s). (The Young's modulus is 50 x
109 N/m2 and its density is 2.7 x 103 kg/m3.)
Select the correct answer.

1. 4.3
2. 4.4
3. 4.1
4. 4.6
5. 3.9

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11
A point source emits sound waves with a power
output of 200 watts. What is the sound level (in
dB) at a distance of 50 m? Select the correct
answer.

1. 98
2. 75
3. 76
4. 119
5. 78

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12
While you are sounding a tone on a toy whistle,
you notice a friend running toward you. If you
want her to hear the same frequency that you hear
even though she is approaching, you must _____ .
Select the correct answer.

1. stay put
2. run towards her at the same speed
3. run away from her at the same speed
4. stay put and play a note of higher frequency
5. run towards her and play a note of higher
   frequency

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