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Sound — Question 13

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Question 13

The diagram shown below depicts a displacement time graph of particle a wave travelling with speed 20 m/s.

The diagram shown below depicts a displacement time graph of particle a wave travelling with speed 20 m/s. Sound, Concise Physics Solutions ICSE Class 10.

The frequency of the wave is :

  1. 50 Hz
  2. 33.3 Hz
  3. 100 Hz
  4. 1000 Hz
Answer

50 Hz

Reason — We know,

Frequency = 1Time period\dfrac{1}{\text{Time period}}

Given, time period = 0.02 sec

Substituting we get,

f = 10.02\dfrac{1}{0.02} = 1002\dfrac{100}{2} = 50 Hz

Hence, f = 50 Hz