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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
If $20$ waves are produced per second, what is the frequency in hertz$?$
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Answer

The frequency in hertz is equal to the number of waves produced per second. In this case, $20$ waves are produced per second, so the frequency of sound waves is $20$ hertz.

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