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A passenger is sitting in a train which is moving fast. The engine of the train blows a whistle of frequency ' $n$ '. If the apparent frequency of sound heard by the passenger is ' $f$ ' then
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The correct answer is:
$\mathrm{f}=\mathrm{n}$
There is no relative motion between source and listener.
$$
\therefore \quad \mathrm{f}=\mathrm{n}
$$
$$
\therefore \quad \mathrm{f}=\mathrm{n}
$$
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