Sound

1
Sound
2
What does sound travel through?
3

• Solids, Liquids, and Gases

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What does sound not travel through?
5

• Vacuum

6
What causes sound?
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• Vibrations

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What does one complete wavelength look like?
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(No Transcript)
10
What does a wave with a low pitch look like?
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(No Transcript)
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What does a wave with a high pitch look like?
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(No Transcript)
14
What is the top of a wavelength called?
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• Crest

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What is the bottom of a wavelength called?
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• Trough

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How do we measure wavelengths?
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• From Crest to Crest

20
Why does sound travel faster along a metal fence
than a swimming pool?
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• The molecules are closer together in a solid

22
How is the sound you hear underwater different
from the sound you hear in air?
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• The sound underwater travels faster than in the
  air

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What is the number of times a sound vibrates in
one second called?
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• Frequency

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What is the highness or lowness of a sound called?
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• Pitch

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What is the relationship between pitch and
frequency?
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• The greater the frequency, the higher the pitch

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What pitch do shorter strings produce?
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• High
• (they vibrate faster)

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What pitch do longer strings produce?
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• Low
• (they vibrate slower)

34
What do animals use to help detect objects?
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• Echolocation

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Why cant people hear some sounds that animals
can?
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• The pitch is either too high or too low

38
What device is used to detect objects moving
through air or space?
39

• Radar

40
What type of device is used to locate objects
moving underwater?
41

• Sonar