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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 vibrations is different for different objects. But we can only hear the vibrations which lie between 20 Hz to 20000 Hz, so sound of every vibration cannot be heard by us.

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