PHYSICS 1305 EXAM 1 ACTUAL QUESTIONS WITH DETAILED
ANSWERS
Question 1.
1. Changing which of the following affects the period of a pendulum? a) mass b) amplitude
c) length d) angle
Correct Answer: c. length
Question 2.
2. If you double the frequency of a vibrating object, what happens to the period? a) the
period doubles b) the period stays the same c) the period is cut in half d) not enough
information is given to answer this question.
Correct Answer: c) the period is cut in half
Question 3.
3. A pendulum passes in 2 seconds. (Assume one of the endpoints frequency of the
pendulum a) 36 Hertz b) 12 Hertz c) 18 Hertz d) 18/3 Hertz
Correct Answer: the nose of an observer 24 times b) 12 hertz that the observers
nose is at of the pendulums path.) The is
Question 4.
4. The distance from trough to trough on a periodic wave is called its a) frequency. b)
period. c) wavelength. d) amplitude.
Correct Answer: c) wavelength.
Question 5.
5. Suppose that a of 3000 Hertz. If you the frequency to be conclude that a) the train is
moving b) the train is moving c) the sound from d) not enough information
Correct Answer: train whistle at rest has a frequency b) the train is moving
to-are standing still and observe ward you 3010 Hertz (higher pitch), you can
away from you. toward you the whistle has echoed is given
Question 6.
6. Radio waves travel at the speed of light, 300,000 km/s. For 300 MHz radio waves, the
wavelength is... a) 1 meter b) 1000 meters c) 1,000,000 meters d) 1/1000 meters
Correct Answer: a) 1 meter
, Question 7.
7. Of the following properties of a wave, the one that depends only on the type of medium
is a) amplitude b) wave speed c) wavelength d) frequency
Correct Answer: b) wave speed
Question 8.
8. Reverberation is actually a case of a) sound interference. b) forced vibrations. c)
re-echoed sound. d) resonance. e) none of these.
Correct Answer: c) re-echoed sound.
Question 9.
9. The Tacoma Narrows of a) forced vibration b) sound vibration c) resonance d) standing
water
Correct Answer: Bridge collapse is an example c) resonance waves
Question 10.
10. The speed of sound is about 340m/s. If someone fires a gun near a cliff and hears an
echo four seconds later then the cliff is about a) 170 meters away. b) 340 meters away. c)
680 meters away. d) 3400 meters away. e) 6800 meters away.
Correct Answer: c) 680 meters away.
Question 11.
11. Which of the following is not a medium which will transmit sound? a. solids b. liquids c.
gasses d. vacuum
Correct Answer: d. vacuum
Question 12.
12. The first harmonic of a guitar string has ______nodes. a) 1 b) 2 c) 3 d) 4
Correct Answer: b) 2
Question 13.
13. A sound wave has a wavelength of 6 meters. The distance from a compression center
to the adjacent rarefaction is a) 0.75 meters b) 1.5 meters c) 3 meters d) unknown unless
the wave speed is given. e) unknown unless the frequency is given.
Correct Answer: c) 3 meters
ANSWERS
Question 1.
1. Changing which of the following affects the period of a pendulum? a) mass b) amplitude
c) length d) angle
Correct Answer: c. length
Question 2.
2. If you double the frequency of a vibrating object, what happens to the period? a) the
period doubles b) the period stays the same c) the period is cut in half d) not enough
information is given to answer this question.
Correct Answer: c) the period is cut in half
Question 3.
3. A pendulum passes in 2 seconds. (Assume one of the endpoints frequency of the
pendulum a) 36 Hertz b) 12 Hertz c) 18 Hertz d) 18/3 Hertz
Correct Answer: the nose of an observer 24 times b) 12 hertz that the observers
nose is at of the pendulums path.) The is
Question 4.
4. The distance from trough to trough on a periodic wave is called its a) frequency. b)
period. c) wavelength. d) amplitude.
Correct Answer: c) wavelength.
Question 5.
5. Suppose that a of 3000 Hertz. If you the frequency to be conclude that a) the train is
moving b) the train is moving c) the sound from d) not enough information
Correct Answer: train whistle at rest has a frequency b) the train is moving
to-are standing still and observe ward you 3010 Hertz (higher pitch), you can
away from you. toward you the whistle has echoed is given
Question 6.
6. Radio waves travel at the speed of light, 300,000 km/s. For 300 MHz radio waves, the
wavelength is... a) 1 meter b) 1000 meters c) 1,000,000 meters d) 1/1000 meters
Correct Answer: a) 1 meter
, Question 7.
7. Of the following properties of a wave, the one that depends only on the type of medium
is a) amplitude b) wave speed c) wavelength d) frequency
Correct Answer: b) wave speed
Question 8.
8. Reverberation is actually a case of a) sound interference. b) forced vibrations. c)
re-echoed sound. d) resonance. e) none of these.
Correct Answer: c) re-echoed sound.
Question 9.
9. The Tacoma Narrows of a) forced vibration b) sound vibration c) resonance d) standing
water
Correct Answer: Bridge collapse is an example c) resonance waves
Question 10.
10. The speed of sound is about 340m/s. If someone fires a gun near a cliff and hears an
echo four seconds later then the cliff is about a) 170 meters away. b) 340 meters away. c)
680 meters away. d) 3400 meters away. e) 6800 meters away.
Correct Answer: c) 680 meters away.
Question 11.
11. Which of the following is not a medium which will transmit sound? a. solids b. liquids c.
gasses d. vacuum
Correct Answer: d. vacuum
Question 12.
12. The first harmonic of a guitar string has ______nodes. a) 1 b) 2 c) 3 d) 4
Correct Answer: b) 2
Question 13.
13. A sound wave has a wavelength of 6 meters. The distance from a compression center
to the adjacent rarefaction is a) 0.75 meters b) 1.5 meters c) 3 meters d) unknown unless
the wave speed is given. e) unknown unless the frequency is given.
Correct Answer: c) 3 meters
