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Sound — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceSound2 Marks
Question
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us?
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Answer

Since, range of frequency for every vibrating body is diffrent. But we can hear the vibrations which lies between the range of frequencies from 20 Hz, so sound of every vibrating body cannot be heard by us.

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