Physical Science: Waves, Sound, and Light, Book O

Chapter 2: Sound

Sound

Your Results:

The correct answer for each question is indicated by a .

1.			The change in pitch due to a moving wave source is called __________. Need a Hint?
			A)	the compressional effect
			B)	resonance
			C)	a rarefaction
			D)	the Doppler effect
2.			The two types of regions that make up compressional waves are __________. Need a Hint?
			A)	compressions and transmissions
			B)	vibrations and transmissions
			C)	compressions and rarefactions
			D)	compressions and extensions
3.			How does temperature of a medium affect the speed of sound waves? Need a Hint?
			A)	As the temperature of a substance decreases, sound waves in it move faster.
			B)	As the temperature of a substance increases, sound waves in it move more slowly.
			C)	Temperature does not affect the speed of sound waves.
			D)	As the temperature of a substance increases, sound waves in it move faster.
4.			The human perception of sound intensity is __________. Need a Hint?
			A)	acoustics
			B)	loudness
			C)	frequency
			D)	pitch
5.			In the human ear, sound waves are gathered in the __________. Need a Hint?
			A)	inner ear
			B)	cochlea
			C)	outer ear
			D)	middle ear
6.			The __________ is the frequency at which a material tends to vibrate when it is disturbed. Need a Hint?
			A)	pitch
			B)	natural frequency
			C)	quality
			D)	resonance
7.			Which of the following will you hear as a high pitch? Need a Hint?
			A)	sound wave with intensity of 10 dB
			B)	sound wave with intensity of 100 dB
			C)	sound wave with frequency of 50 Hz
			D)	sound wave with frequency of 10,000 Hz
8.			What is the difference between music and noise? Need a Hint?
			A)	It is strictly a matter of opinion.
			B)	Music has a wider range of frequencies than noise.
			C)	Noise has a greater intensity than music.
			D)	Music follows a specified pattern of sounds and pitches, noise has no pattern.
9.			A(n) __________ is a vibration whose frequency is a multiple of the fundamental frequency. Need a Hint?
			A)	overtone
			B)	reverberation
			C)	resonant frequency
			D)	natural frequency
10.			__________ is a system that uses the reflection of underwater sound waves to detect objects. Need a Hint?
			A)	Sonar
			B)	Radar
			C)	Echolocation
			D)	The Doppler Effect
11.			How does a musician change the note played on a woodwind instrument? Need a Hint?
			A)	by extending the slide
			B)	by winding the strings more tightly
			C)	by changing the length of the resonating column of air
			D)	by changing the mouthpiece
12.			What type of waves are sound waves? Need a Hint?
			A)	sonar
			B)	radio
			C)	compressional
			D)	transverse
13.			__________ occurs when waves bend around a barrier. Need a Hint?
			A)	Interference
			B)	Reflection
			C)	Diffraction
			D)	Refraction
14.			In which of the following mediums will sound travel fastest? Need a Hint?
			A)	brick
			B)	oil
			C)	water
			D)	air
15.			As frequency increases, wavelength __________. Need a Hint?
			A)	decreases
			B)	remains constant
			C)	becomes faster
			D)	increases
16.			The echoing effect produced by many reflections of sound is called __________. Need a Hint?
			A)	resonance
			B)	reverberation
			C)	rarefaction
			D)	intensity
17.			The process of locating objects by emitting sounds and interpreting the reflected sound waves is __________. Need a Hint?
			A)	echolocation
			B)	sonar
			C)	radar
			D)	ultrasound
18.			A reflected sound wave also is called __________. Need a Hint?
			A)	a Doppler
			B)	noise
			C)	resonance
			D)	an echo
19.			What is the less dense region of a compressional wave called? Need a Hint?
			A)	rarefaction
			B)	crest
			C)	trough
			D)	rest position
20.			The intensity of sound is measured in units called __________. Need a Hint?
			A)	reverberations
			B)	decibels
			C)	hertz
			D)	dopplers

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