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Frequency received by listener from the rear source is given by n' = v - u / λ.

1. v - u / λ
2. v + u / λ
3. v - u / v + u
4. v + u / v - u

Correct answer: v - u / λ

Solution

The formula n' = (v - u) / λ represents the frequency received by a listener when the source is moving away from the listener. Here, 'v' is the speed of sound, 'u' is the speed of the source, and 'λ' is the wavelength.

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