Question

if a low frequency sound is heard, the sound molecules

Answer 1

Frequency is essentially the number of vibrations of the sound molecules in one second. It is measured in Herts. It is to be noted that 1 Hertz = 1 vibration per second.

According to the given question,
If a low frequency sound is heard, the sound molecules vibrate lesser times in one second. Therefore, the number of vibrations of the sound molecules is lesser as compared to a sound that is of high frequency.

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