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5. Sound
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Q51 of 199 Page 207

Give one use of ultrasound in industry and one in hospitals.

one use of ultrasound in industry is, for detecting flows in metal block.

One use of ultrasound in hospital is, to investigate the internal organs of the human body.


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49

What is meant by the quality (or timbre) of sound? On what factor does the quality (or timbre) of a sound depend?

50

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.

52

How is it that bats are able to fly at night without colliding with other objects?

53

Explain how, bats use ultrasound to catch the prey.

Questions · 199
5. Sound
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