An observer moves towards a stationary source of sound, with a velo...

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An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the
\( \mathrm{P} \) percentage increase in the apparent frequency
[AIEEE 2005; Orrisa JEE 2010; Similar Kerala PET 2009]
(a) \( 5 \% \)
(b) \( 20 \% \)
(c) Zero
(d) \( 0.5 \% \)
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