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Sound — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
Why do we not hear the screams of a bat:
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Answer

  1. The screams are ultrasonic
Explanation:
This is because the screams are ultrasonic (above 20,000 hertz) which the human ear cannot hear as humans can only hear the sound in the range of 20 Hz − 20,000 Hz.

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