33 terms

Chapter 12: Waves and Sound

A wiggle in time is a
A) vibration
B) wave
C) both
D) neither
A common source of wave motion is a
A) wave pattern.
B) harmonic object
C) vibrating object
D) region of variable high and low pressure
E) none of these
Like a transverse wave, a longitudinal wave has
A) amplitude, frequency, wavelength, and speed
B) amplitude, frequency, and wavelength
C) amplitude, wavelength, and speed
D) wavelength, speed, and frequency
E) amplitude, frequency, and speed
In a longitudinal wave the compressions and rarefactions travel in
A) the same
B) opposite directions.
C) a vacuum.
Which of the following is not a transverse wave?
A) sound
B) light
C) radio
D) all of these
E) none of these
The vibrations of a transverse wave move in a direction
A) along the direction of wave travel.
B) at right angles to the direction of wave travel.
C) that changes with speed
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.
C) that changes with speed.
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
Wave interference occurs for
A) sound waves.
B) light waves.
C) water waves.
D) All of the above choices are correct.
E) None of the above choices are correct.
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.
You dip your finger repeatedly into water and make waves. If you dip your finger more
frequently, the wavelength of the waves
A) shortens.
B) lengthens.
C) stays the same.
During a single period, the distance traveled by a wave is
A) one-half wavelength.
B) one wavelength.
C) two wavelengths.
An aircraft that flies faster than the speed of sound is said to be
A) subsonic.
B) supersonic.
C) impossible.
As a supersonic craft increases in speed, the angle of its V-shaped shock wave becomes
A) wider.
B) narrower.
C) neither
The source of a sonic boom
A) must itself be an emitter of sound.
B) may or may not be an emitter of sound.
C) is not itself an emitter of sound.
The pendulum with the greatest frequency is the pendulum with the
A) shortest period.
B) shortest length.
C) shortest period and the shortest length.
D) shortest amplitude.
E) greatest amplitude.
Double the frequency of sound and you also double its
A) wavelength.
B) speed.
C) amplitude.
D) all of these
E) none of these
We are best at hearing
A) infrasonic sound.
B) ultrasonic sound.
C) both infrasonic and ultrasonic sounds.
D) None of the above choices are true.
A sound wave is a
A) longitudinal wave.
B) transverse wave.
C) standing wave.
D) shock wave.
E) None of the above choices are correct.
Compressions and rarefactions are characteristic of
A) longitudinal waves.
B) transverse waves.
C) both longitudinal and transverse waves.
D) Neither of the above choices are correct
Sound will be louder if a struck tuning fork is held
A) in the air.
B) with its base against a table top.
C) with its prongs in shallow water.
D) in your closed fist.
A base fiddle is louder than a harp because of its
A) thicker strings.
B) sounding board.
C) lower pitch.
D) All of the above are true.
E) None of the above are true.
The natural frequency of an object depends on its
A) size, shape and elasticity.
B) size and shape.
C) size and elasticity.
D) shape and elasticity.
The object with the highest natural frequency is a
A) small bell.
B) large bell.
C) medium size bell.
The least energy required to produce forced vibration in an object occurs
A) below its natural frequency.
B) at its natural frequency.
C) above its natural frequency.
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) forced vibrations.
B) resonance.
C) beats.
D) reverberation.
E) wave interference.
In the case of radio, which has the higher frequency?
A) Carrier wave
B) Sound wave
C) Neither. Both may be of the same frequency.
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) tend to be refracted downward.
C) travel without refraction
Sound refraction depends on the fact that the speed of sound is
A) constant.
B) variable.
C) proportional to frequency.
D) inversely proportional to wavelength.
E) None of the above choices are correct.
When the handle of a tuning fork is held solidly against a table, the sound becomes
louder and the time that the fork keeps vibrating
A) becomes longer.
B) becomes shorter.
C) remains the same.
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.
In which one of these media does sound travel the fastest?
A) water vapor
B) water
C) ice
D) steam
E) Sound travels the same speed in each of the above media.
Inhaling helium increases the pitch of your voice. The reason for this is that sound
A) slower in helitun than in air.
B) faster in helium than in air.
C) the same speed in helium, but the wavelength is greater.