A source and an observer approach each other with same velocity \( ...

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A source and an observer approach each other with same velocity \( 50 \mathrm{~m} / \mathrm{s} \). If the apparent frequency is \( 435 \mathrm{sec}^{-1} \), then
\( \mathrm{P} \) the real frequency is
[CPMT 2003; Similar KCET 1999; RPMT 2006]
W
(a) \( 320 \mathrm{sec}^{-1} \)
(b) \( 360 \mathrm{sec}^{-1} \)
(c) \( 390 \mathrm{sec}^{-1} \)
(d) \( 420 \mathrm{sec}^{-1} \)
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