A sound wave of wavelength λ λ travels towards the right horizontally with a velocity V. It strikes and reflects from a vertical plane surface, travelling at a speed v towards the left. The number of positive crests striking in a time interval of three seconds on the wall is B
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The relative velocity of sound waves with respect to the walls is V + v. Hence the apparent frequency of the waves striking the surface of the wall is (V + v)/ λ λ . The number of positive crests striking per second is the same as frequency. In three seconds the number is [3 (V + v)]/ λ λ .
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