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Two sound sources emitting sound each of wavelength λ are fixed at a given distance apart. A listener moves with a velocity u along the line joining the two sources. The number of beats heard by him per second is

1. u / 2λ
2. 2u / λ
3. u / λ
4. u / 3λ

Correct answer: u / λ

Solution

The listener moving along the line joining the two sources will experience a Doppler effect for each source. The beat frequency is the difference in the frequencies perceived from the two sources, which is given by u/λ.

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