A motor car blowing a horn of frequency \( 124 \mathrm{vib} / \math...

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A motor car blowing a horn of frequency \( 124 \mathrm{vib} / \mathrm{sec} \) moves with a velocity \( 72 \mathrm{~km} / \mathrm{hr} \) towards a tall wall. The frequency
\( \mathrm{P} \) of the reflected sound heard by the driver will be (velocity of sound in air is \( 330 \mathrm{~m} / \mathrm{s} \) )
W
[MP PET 1997; IIT-JEE 2011; Similar KCET 2007]
(a) \( 109 \mathrm{vib} / \mathrm{sec} \)
(b) \( 132 \mathrm{vib} / \mathrm{sec} \)
(c) \( 140 \mathrm{vib} / \mathrm{sec} \)
(d) \( 248 \mathrm{vib} / \mathrm{sec} \)
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