A sound source is moving towards a stationary observer with \( (1 /...

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A sound source is moving towards a stationary observer with \( (1 / 10) \) of the speed of sound. The
\( \mathrm{P} \) ratio of apparent to real frequency is

W
(1) \( \frac{10}{9} \)
(2) \( \frac{11}{10} \)
(3) \( \left(\frac{11}{10}\right)^{2} \)
(4) \( \left(\frac{9}{10}\right)^{2} \)
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