A source producing sound of frequency \( 170 \mathrm{~Hz} \) is app...

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A source producing sound of frequency \( 170 \mathrm{~Hz} \) is approaching a stationary observer with a velocity \( 17 \mathrm{~ms}^{-1} \).
\( \mathrm{P} \) The apparent change in the wavelength of sound heard by the observer is (speed of sound in air \( =340 \mathrm{~ms}^{-1} \) )
W
(a) \( 0.1 \mathrm{~m} \)
(b) \( 0.2 m \)
(c) \( 0.4 \mathrm{~m} \)
(d) \( 0.5 \mathrm{~m} \)
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