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Suppose that the speed of sound in air at a given temperature is \( 400 \mathrm{~m} / \mathrm{sec} \). An engine blows a whistle at
\( \mathrm{P} \) \( 1200 \mathrm{~Hz} \) frequency. It is approaching an observer at the speed of \( 100 \mathrm{~m} / \mathrm{sec} \). What is the apparent frequency as
W heard by the observer
[CPMT 1983; DPMT 2001;
WB-JEE 2012]
(a) \( 600 \mathrm{~Hz} \)
(b) \( 1200 \mathrm{~Hz} \)
(c) \( 1500 \mathrm{~Hz} \)
(d) \( 1600 \mathrm{~Hz} \)
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