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Q.

If the time period of a sound wave increases, then its frequency will : 

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a

Increase

b

Remain the same

c

First increases then decrease

d

Decrease

answer is B.

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Detailed Solution

  • The number of vibrations made by a particle of the medium in one second is called the frequency of a sound wave.
  • The frequency of the vibrating source of sound is calculated in cycles per second.
  • The SI unit for frequency is hertz and its definition is ‘1/T’ where T refers to the time period of the wave.
  • Frequency is inversely proportional to the time period of the wave.
  • So when the time period of the sound wave increases then the frequency will decrease.
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