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Q.

A boy is listening to a sound of 250 Hz frequency. Sound source is 400 m from the boy. What will be the time period of the sound wave?


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a

0.001 sec

b

0.002 sec

c

0.003 sec

d

0.004 sec 

answer is D.

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Detailed Solution

The time period of the sound wave is given by 0.004 sec.
Given: frequency f=250 Hz.
It is known that the frequency is the number of oscillations in one second. Mathematically,
T=1f
Where T is the time period and f is the frequency.
On substituting the given values, we get the time period as
⇒T=1250
⇒T=0.004 s
So, the time period is 0.004 s.
 
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