S is source R is receiver. R and S are at rest. Frequency of sound from S is f. The beat frequency registered by R is 
. Find k. Given, velocity of sound is v.
Text Solution
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(2)
Sound received by receiver one is direct and another by reflected sound from wall frequency direct received = f = F ' = 
f
Apparent frequency at receiver after reflection from wall f ’’ = 
f' = 
f
so beat frequency received = f b = f – f ’’ = 
f
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