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
\( \mathrm{P} \) sound. what is the percentage increase in the

W apparent frequency?
(1) Zero
(2) \( 0.5 \% \)
(3) \( 5 \% \)
(4) \( 20 \% \)
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