Name: __________________________ Date: _____________



1.
An object attached to one end of a spring makes 20 vibrations in 10s. Its period is:
A.
2 Hz
B.
10 s
C.
0.5 Hz
D.
2 s
E.
0.50 s


2.
A weight suspended from an ideal spring oscillates up and down with a period T. If the amplitude of the oscillation is doubled, the period will be:
A.
T
B.
1.5 T
C.
2T
D.
T/2
E.
4T


3.
A 0.20-kg object mass attached to a spring whose spring constant is 500 N/m executes simple harmonic motion. If its maximum speed is 5.0 m/s, the amplitude of its oscillation is:
A.
0.0020 m
B.
0.10 m
C.
0.20 m
D.
25 m
E.
250 m


4.
A particle moves in simple harmonic motion according to x = 2cos(50t), where x is in meters and t is in seconds. Its maximum velocity in m/s is:
A.
100 sin(50t)
B.
100 cos(50t)
C.
100
D.
200
E.
none of these


5.
A simple pendulum of length L and mass M has frequency f. To increase its frequency to 2f:
A.
increase its length by length to 4L
B.
increase its length by length to 2L
C.
decrease its length by length to L/2
D.
decrease its length by length to L/ 4
E.
decrease its mass by length to < M/4


6.
A sinusoidal wave is traveling toward the right as shown. Which letter correctly labels the amplitude of the wave?
A.
A
B.
B
C.
C
D.
D
E.
E


7.
A sinusoidal wave is traveling toward the right as shown. Which letter correctly labels the wavelength of the wave?
A.
A
B.
B
C.
C
D.
D
E.
E


8.
Let f be the frequency, v the speed, and T the period of a sinusoidal traveling wave. The correct relationship is:
A.
f = 1/T
B.
f = v + T
C.
f = vT
D.
f = v/T
E.
f = T/v


9.
A wave is described by y(x,t) = 0.1 sin(3x – 10t), where x is in meters, y is in centimeters and t is in seconds. The angular frequency is:
A.
0.10 rad/s
B.
3.0 rad/s
C.
10π rad/s
D.
20π rad/s
E.
(10/ rad/s


10.
The speed of a sinusoidal wave on a string depends on:
A.
the frequency of the wave
B.
the wavelength of the wave
C.
the length of the string
D.
the tension in the string
E.
the amplitude of the wave


11.
The tension in a string with a linear density of 0.0010 kg/m is 0.40 N. A 100 Hz sinusoidal wave on this string has a wavelength of:
A.
0.05 cm
B.
2.0 cm
C.
5.0 cm
D.
20 cm
E.
100 cm


12.
A stretched string, clamped at its ends, vibrates in its fundamental frequency. To double the fundamental frequency, one can change the string tension by a factor of:
A.
2
B.
4
C.
D.
1/2
E.


13.
The speed of a sound wave is determined by:
A.
its amplitude
B.
its intensity
C.
its pitch
D.
number of overtones present
E.
the transmitting medium


14.
A fire whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340 m/s. The wavelength of this sound is about:
A.
0.5 m
B.
1.0 m
C.
2.0 m
D.
3.0 m
E.
340 m


15.
Which of the following properties of a sound wave determine its "pitch"?
A.
amplitude
B.
distance form source to detector
C.
frequency
D.
phase
E.
speed


16.
The intensity of sound wave A is 100 times that of sound wave B. Relative to wave B the sound level of wave A is:
A.
–2 db
B.
+2 db
C.
+10 db
D.
+20 db
E.
+100 db


17.
The intensity of a certain sound wave is 6 μW/cm2. If its intensity is raised by 10 decibels, the new intensity (in μW/cm2) is:
A.
60
B.
6.6
C.
6.06
D.
600
E.
12


18.
A piano wire has a length of 81 cm and a mass of 2.0 g. If its fundamental frequency is to be 394 Hz, it tension must be:
A.
0.32 N
B.
63 N
C.
130 N
D.
250 N
E.
none of these


19.
A source emits sound with a frequency of 1000 Hz. Both it and an observer are moving in the same direction with the same speed, 100 m/s. If the speed of sound is 340 m/s, the observer hears sound with a frequency of:
A.
294 Hz
B.
545 Hz
C.
1000 Hz
D.
1830 Hz
E.
3400 Hz


20.
A source emits sound with a frequency of 1000 Hz. It and an observer are moving toward each other, each with a speed of 100 m/s. If the speed of sound is 340 m/s, the observer hears sound with a frequency of:
A.
294 Hz
B.
545 Hz
C.
1000 Hz
D.
1830 Hz
E.
3400 Hz


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