Question

A band playing music at frequency f is moving towards a wall at a speed \(v_b\). 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

• A. \(\frac{v + v_m}{v + v_b} f\)
• B. \(\frac{v + v_m}{v - v_b} f\)
• C. \(\frac{2v_b (v + v_m)}{v^2 - v_b^2} f\)
• D. \(\frac{2v_m (v + v_b)}{v^2 - v_m^2} f\)

Answer 1

The Correct Option is C

The correct option is(C): \(\frac{2v_b (v + v_m)}{v^2 - v_b^2} f\)