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A train is moving with a uniform speed of \( 33 \mathrm{~m} / \mathrm{s} \) and an observer is approaching the train with the same speed. If the
\( \mathrm{P} \) train blows a whistle of frequency \( 1000 \mathrm{~Hz} \) and the velocity

W of sound is \( 333 \mathrm{~m} / \mathrm{s} \) then the apparent frequency of the sound that the observer hear is
[WB JEE 2015]
(a) \( 1220 \mathrm{~Hz} \)
(b) \( 1099 \mathrm{~Hz} \)
(c) \( 1110 \mathrm{~Hz} \)
(d) \( 1200 \mathrm{~Hz} \)
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