How is sound produced? Name two sources ...

How is sound produced? Name two sources of sound.

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ICSE-SOUND-EXERCISES (Section II) (Short Answer Questions)

How is sound produced? Name two sources of sound.
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Define frequency of a vibrating body. Write its Sl unit.
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Define amplitude of a vibrating body. What is its SI unit?
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What do you mean by ultrasonic sound? Where is it used?
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Name the three characteristics of sound.
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How is pitch related to frequency?
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How does loudness depend on the amplitude of vibration?
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What is timbre of a sound?
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What is an echo? How is it produced?
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