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A band playing music at a frequency f is...

A band playing music at a frequency f is moving towards a wall at a speed `v_h`. A motorist is following the band with a speed `v_m` . If v is the speed of sound, the expression for the beat frequency heard by the motorist is `(n(V+V_m)V_b)/((V^2 - V_b^2))` . Then n

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