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Q.

The number of vibrations per second is called _________________ of sound.

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a

Wavelength 

b

Frequency 

c

Waves

d

Amplitude 

answer is A.

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Detailed Solution

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The number of vibrations per second is called the frequency of sound waves.

It is given by:

Frequency= 1Time period

The SI unit of frequency is sec-1 or Hertz(Hz).

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