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CBSE Class 9 Science Question 8 of 33

Sound — Question 8

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Question

Question 8

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Answer

Given,

Frequency (ν) = 100 Hz

Time (t) = 1 min = 60 s

Frequency (ν) = Number of oscillationsTotal time (t)\dfrac{\text{Number of oscillations}}{\text{Total time (t)}}

Or

Number of oscillations = ν × t

Substituting we get,

Number of oscillations = 100 × 60 = 6000

Hence, the source vibrates 6000 times in a minute.