A substance through which a wave can travel.

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Section 2
Section 3
Section 4
Chapter 2
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2
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• A substance through which a wave can travel.

3
100

• What is a medium?

4
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• The part of the ear where vibrations are
  converted into electrical signals for the brain
  to interpret.

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• What is the inner ear?

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• A disturbance that transmits energy through
  matter or space.

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• What is a wave?

8
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• Sound travels as this type of wave.

9
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• What is a longitudinal wave?

10
500

• As air particles are pushed closer together, they
  create a region of higher density and pressure
  known as this.

11
500

• What is a compression?

12
100

• The technological device that can be used to
  see sound waves is known as this.

13
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• What is an oscilloscope?

14
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• Sounds with frequencies that are lower than 20 Hz.

15
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• What is infrasonic?

16
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• Sounds with very high frequencies used to break
  down kidney stones.

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• What are ultrasonic sounds?

18
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• The frequency of a car horn appears to change as
  a car passes because of this.

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• What is the Doppler effect?

20
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• The speed of sound in air ________as the
  temperature decreases.

21
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• What is decreases?

22
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• When destructive interference occurs, a sound
  will be _____ because the amplitude is ________.

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• What is softer and decreased?

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• This occurs when compressions of one wave overlap
  the rarefactions of another wave.

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• What is destructive interference?

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• Constructive interference occurs when
  rarefactions of one wave overlap ______ of
  another wave.

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• What are rarefactions?

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• The wave interaction most important for
  echolocation is known as this.

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• What is reflection?

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• This type of wave is a result of interference in
  which portions of the wave are at the rest
  position and other portions have a large
  amplitude.

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• What is a standing wave?

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• Sound that includes a random mix of pitches.

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• What is noise?

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• The lowest resonant frequency of a standing wave.

35
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• What is the fundamental?

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• A plucked guitar string creates several of these.

37
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• What are standing waves?

38
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• If 2 sound waves interfere constructively, you
  will hear this.

39
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• What is a louder sound?

40
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• This is used to check the development of an
  unborn baby inside a mothers body.

41
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• What is ultrasonography?

42
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• Instruments that produce sound when struck belong
  to this family.

43
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• What is percussion?

44
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• A car engine, a barking dog, and a radio turned
  to a talk show are all examples of this random
  mix of pitches.

45
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• What is noise?

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• The bending of sound waves around barriers or
  through openings.

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• What is diffraction?

48
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• This is when an object vibrating at or near a
  certain frequency causes a second object to
  vibrate.

49
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• What is resonance?

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500

• When you speak, _______ cords vibrate and create
  compressions and rarefactions.

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• What are vocal cords?