1. The velocity of sound in glycerol is 1. 904 m/s
The velocity of sound in glycerol is m/s. Find the bulk modulus (in N/m2) of glycerol if its density is x 103 kg/m Select the correct answer.
4.6 x 109
4.5 x 109
4.8 x 109
4.9 x 109
5.0 x 109 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. The Young's modulus for lead is 1. 52 x 1010 N/m2
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.
8.72 x 103
9.02 x 103
8.12 x 103
35.2 x 103
34.5 x 103 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. A jet plane has a sound level of 140dB. What is the intensity in W/m2
A jet plane has a sound level of 140dB. What is the intensity in W/m2? Select the correct answer.
100 10 1
1.000
10.000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

4. By what factor will the noise intensity change when sound levels increases by 3 dB? Select the correct answer.
2.0
0.3 4 1 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

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.
wavecrests are farther apart by the distance the car travels in one period
wavecrests are closer together by the distance the car travels in one period
the car gets ahead of each wavecrest before it emits the next one
the speed of sound in air is increased by the speed of the car
a speeding car emits more wavecrests in each period 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

6. A car approaches a stationary police car at 32m/s
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.
547
5.359
593
616
639 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

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. 84
145
122 42
168 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

8. A point source emits sound with a power output of 640. 0 watts
A point source emits sound with a power output of watts. What is the intensity (in W/m2) at a distance of 40.0 m from the source? Select the correct answer.
3.18 x 10-2
3.18 x 10-3
3.18 x 10-4
3.18 x 10-5
3.18 x 102 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

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.
488
465
454
521
977 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

10. A sculptor strikes a piece of marble with a hammer
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.
4.3
4.4
4.1
4.6
3.9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

11. A point source emits sound waves with a power output of 200 watts
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. 98 75 76
119 78 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

12. run towards her at the same speed run away from her at the same speed
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.
stay put
run towards her at the same speed
run away from her at the same speed
stay put and play a note of higher frequency
run towards her and play a note of higher frequency 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50