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S is source R us reciver. R and S are at...

`S` is source `R` us reciver. `R` and `S` are at rest. `F` Frequency of sound from `S` is `f`. The beat frequency registred by `R` is `(kuf)/(v + u)`, Find `k`. Given, velocity of sound is `v`.

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The correct Answer is:
2
Sound received one is direct and another by reflected sound from wall
frequency direct received `= f , f = (V - u)/(V)f`

Apparent frequency at reciver after reflection from wall `f' = (V)/(V + u)f' = (V - u)/(v + u) f`
so beat frequency received `= f_(b) = f =- f' = (2u)/(V u)f`
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