Review for Test #1:      Phy 101          Spring 2004        RBF

1)  Unlike a transverse wave, a longitudinal wave has

A) no amplitude.

B) no frequency.

C) no wavelength.

D) no speed.

E) ...a longitudinal wave has all of these.

2)  Which of the following is not a transverse wave?

A) Sound.

B) Light.

D) All of these.

E) None of these.

3)  The vibrations of a longitudinal wave move in a direction

A) along the direction of wave travel.

B) at right angles to the direction of wave travel.

Figure 18A-1

4)  Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave

A) 0.3 m.

B) 3.0 m.

C) 30 m.

D) 300 m.

E) none of these.

5)  If the frequency of a certain wave is 10 hertz, its period is

A) 0.1 seconds. B)  10 seconds. C)  100 seconds. D)  none of these.

6)  To say that one wave is out of phase with another is to say that the waves are

A) of different amplitudes.

B) of different frequencies.

C) of different wavelengths.

D) out of step.

E) all of these.

7)  A standing wave occurs when

A) two waves overlap.

B) a wave reflects upon itself.

C) the speed of the wave is zero or near zero.

D) the amplitude of a wave exceeds its wavelength.

8)  The Doppler effect is characteristic of

A) water waves.

B) sound waves.

C) light waves.

D) all of these.

E) none of these.

9)  An observer on the ground hears a sonic boom which is created by an airplane

flying at a speed

A) just below the speed of sound.

B) equal to the speed of sound.

C) greater than the speed of sound.

D) all of these.

E) none of these.

10)  A floating leaf oscillates up and down two complete cycles each second as a water

wave passes by.  What is the wave's frequency?

A) 0.5 hertz. B)  1 hertz. C)  2 hertz. D)  3 hertz. E)  6 hertz.

11)  A wave travels an average distance of 6 meters in one second. What is the wave's velocity?

A) less than 0.2 m/s.

B) 1 m/s.

C) 3 m/s.

D) 6 m/s.

E) more than 6 m/s.

12)  A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by.  The speed of the wave is

A) 2 m/s.

B) 5 m/s.

C) 10 m/s.

D) 15 m/s.

E) none of these.

13)  The source of every sound is something that is

A) vibrating.

B) moving.

C) accelerating.

D) undergoing simple harmonic motion.

E) a net emitter of energy.

14)  Double the frequency of a sound and you halve its

A) wavelength.

B) speed.

C) amplitude.

D) all of these.

E) none of these.

15)  The range of human hearing is from about

A) 10 hertz to 10,000 hertz.

B) 20 hertz to 20,000 hertz.

C) 40 hertz to 40,000 hertz.

D) actually all of these, depending on the person.

16)  A sound wave is a

A) longitudinal wave.

B) transverse wave.

C) standing wave.

D) shock wave.

E) none of these.

17)  Sound waves cannot travel in

A) air.

B) water.

C) steel.

D) a vacuum.

E) sound can travel in all of these.

18)  A wave having a frequency of 1000 hertz vibrates at

A) less than 1000 cycles per second.

B) 1000 cycles per second.

C) more than 1000 cycles per second.

19)  Reverberation is actually a case of

A) sound interference.

B) forced vibrations.

C) re-echoed sound.

D) resonance.

E) none of these.

20)  The explanation for refraction must involve a change in

A) frequency.

B) wavelength.

C) speed.

D) all of these.

E) none of these.

21)  The frequencies of sound that carry farther in air are relatively

A) low. B)  high. C)  no difference.

22)  The natural frequency of an object depends on its

A) elasticity. B)  size and shape.

C) both of these. D)  neither of these.

23)  The object with the higher natural frequency is a

A) small bell. B)  large bell.

24)  Caruso is said to have made a crystal chandelier shatter with his voice.

This is a demonstration of

A) an echo.

B) sound refraction.

C) beats.

D) resonance.

E) interference.

25)  Which doesn't belong to the same family?

A) Infrasonic waves.

B) Ultrasonic waves.

D) Shock waves.

E) Longitudinal waves.

26)  For AM radio, the A stands for

A) acceleration.

B) authorized.

C) amplitude.

D) agony.

E) almost.

27)  A 340-hertz sound wave travels at 340 m/s in air with a wavelength of

A) 1 m.

B) 10 m.

C) 100 m.

D) 1000 m.

E) none of these.

28)  In which one of these does sound travel the fastest?

A) water vapor.

B) water.

C) ice.

D) steam.

E) ...sound travels the same speed in each of these.

29)  Beats are produced when two tuning forks, one of frequency 240 hertz and the other of

frequency 246 hertz are sounded together. The frequency of the beats is

A) 6 hertz.

B) 12 hertz.

C) 240 hertz.

D) 245 hertz.

E) none of these.

30)  Repeatedly tap the side of a drinking glass with a spoon while filling it with water

and you will notice that the pitch of the sound

A) increases.

B) decreases.

C) remains relatively constant.

31)  A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork

when he strikes them at the same time and the number of beats he hears each second is

A) 0. B)  1. C)  2. D)  3. E)  4.

32)  The pitch of a musical sound depends on the sound wave's

A) wavelength.

B) frequency.

C) speed.

D) amplitude.

E) all of these.

33)  A decibel is a measure of a sound's

A) frequency.

B) wavelength.

C) speed.

D) loudness.

E) all of these.

34)  The quality of a musical note has to do with its

A) loudness.

B) frequency.

C) harmonics.

D) amplitude.

E) all of these.

35)  Reverberation is a phenomenon you would be most likely to hear if you sing in the

A) shower. B)  desert.

36)  The frequency of a note one octave higher in pitch than a 440-Hz note is

A) 1760 Hz. B)  880 Hz. C)  440 Hz. D)  220 Hz. E)  110 Hz.

37)  Fourier discovered that periodic waves can be represented by

A) a series of non-periodic waves.

B) the summation of a series of simple sine waves.

C) a binary code.

38)  Compared to a sound of 40 decibels, a sound of 50 decibels is

A) 10 times as intense.

B) 100 times as intense.

C) 1000 times as intense.

D) 10,000 times as intense.

E) more than 10,000 times as intense.

39)  A cello string 0.75 m long has a fundamental frequency of 220 hertz.

The speed of a wave on the string is

A) 165 m/s.

B) 220 m/s.

C) 294 m/s.

D) 330 m/s.

E) none of these.

Figure 20A-1

40)  The longitudinal waves shown above all have the same speed. If they are sound waves,

which corresponds to the highest pitch?

A) I B)  II C)  III D)  IV E)  V

41)  Resonance can be looked at as forced vibration with the

A) least amount of energy input.

B) maximum amount of energy input.

C) matching of wave amplitudes.

D) matching of constructive and destructive interference.

E) minimum beat frequency.

42)  Inhaling helium increases the pitch of your voice.  The reason for this is that sound travels

A) slower in helium than in air.

B) faster in helium than in air.

C) the same speed in helium, but the wavelength is greater.