A band playing music at a frequency \( f \) is moving towards a wall at a speed \( v_{b} \). A m...

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A band playing music at a frequency \( f \) is moving towards a wall at a speed \( v_{b} \). A motorist is following the band with a
\( \mathrm{P} \) speed \( v_{m} \). If \( v \) is the speed of sound. Obtain an expression for

W the beat frequency heard by the motorist.
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