Chattahoochee Technical College
PHYS1110
Chapter #20
Conceptual Physics
Quiz #17
Spring 2013
Name:__________________________________
Due: 9:00 a.m. on Thursday, March 21, 2013
1) Sound will be louder if a struck tuning fork is held
A) with its base against a table top.
C) in the air.
B) in your closed fist.
D) with its prongs in shallow water.
1)
2) Suppose you sound a 1056-hertz tuning fork at the same time you strike a note on the piano and
hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What
is the frequency of the piano string?
A) 1056 hertz
B) 1059 hertz
C) 1054 hertz
D) 1058 hertz
E) 1053 hertz
2)
3) In which one of these media does sound travel the fastest?
A) water vapor
B) water
C) steam
D) ice
E) Sound travels the same speed in each of the above media.
3)
4) An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to
reach you is
A) 70 seconds.
B) 20 seconds.
C) 100 second.
D) more than 200 seconds.
E) 30 second.
4)
5) The source of every sound is something that is
A) vibrating.
B) undergoing simple harmonic motion.
C) accelerating.
D) moving.
E) a net emitter of energy.
5)
6) Reverberation is actually a case of
A) re-echoed sound.
B) resonance.
C) sound interference.
D) forced vibrations.
E) none of the above
6)
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7) Double the frequency of a sound and you halve its
A) amplitude.
B) speed.
C) wavelength.
D) all of these
E) none of these
7)
8) The frequencies of sound that carry farther in air are
A) ultrasonic.
B) high.
C) low.
9) The beat frequency produced when a 240 hertz tuning fork and a 243 hertz tuning fork are sounded
together is
A) 6 hertz.
B) 12 hertz.
C) 9 hertz.
D) 3 hertz.
E) None of the above choices are correct.
8)
9)
10) A 170-hertz sound wave travels at 340 m/s in air with a wavelength of
A) 17 m.
B) 0.5 m.
C) 2 m.
D) 1 m.
E) None of the above choices are correct.
10)
11) The explanation for refraction must involve a change in
A) speed.
B) frequency.
C) wavelength.
D) All of the above choices are true.
E) None of the above choices are true.
11)
12) When the speed of sound near the ground is greater than it is at higher altitudes, the sound tends to
be bent
A) downward.
B) to the left.
C) upward.
D) to the right.
E) None of the above choices are correct.
12)
13) The phenomenon of beats results from sound
A) refraction.
B) interference.
C) reflection.
D) all of these
E) none of these
13)
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14) For AM radio, the A stands for
A) authorized.
B) almost.
C) agony.
D) acceleration.
E) amplitude.
14)
15) Sound waves can interfere with one another so that no sound results.
A) True
B) False
C) Either true or false, depending on the air temperature.
15)
16) On some days, air nearest the ground is colder than air that is higher up. On one of these days,
sound waves
A) tend to be refracted upward.
B) travel without refraction.
C) tend to be refracted downward.
16)
17) The approximate range of human hearing is
A) 40 hertz to 40,000 hertz.
B) 10 hertz to 10,000 hertz.
C) 20 hertz to 20,000 hertz.
D) Actually all of these – depends on the hearing ability of the person.
17)
18) Refraction of sound can occur in
A) air.
C) both air and water.
18)
B) water.
D) neither air nor water.
19) Sound travels faster in
A) a vacuum.
B) water.
C) air.
D) steel.
E) Sound travels at about the same speed in all of the above media.
19)
20) When you tune a radio to a certain station, you match the frequency of the internal electrical circuit
to the frequency of the wanted radio station. In so doing you are employing the principle of
A) resonance.
B) beats.
C) forced vibrations.
D) reverberation.
E) wave interference.
20)
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