A person with vibrating tuning fork of frequency 
is moving towards a vertical wall with a speed of 
. Velocity of sound in air is 
. The number of beats heard by that person per second is
Text Solution
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Frequency of tuning fork (source), 
Velocity of sound, 
When the person is moving towards the wall, the frequency of sound reaching the wall is
On reflection wall acts as source and person is the listener moving towards the source. So the frequency heard by the person after reflection from the wall is
Substituting the value of 
from eq. (i) in (ii), we get
Number of beats heard per second 
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