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 speed \( v_{m} \). If \( v \) be the speed of the sound, the expression for beat
\( P \) frequency heard by motorist, is
(a) \( \frac{v+v_{m}}{v+v_{b}} f \)
(b) \( \frac{v+v_{m}}{v-v_{b}} f \)
(c) \( \frac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f \)
(d) \( \frac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f \)
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