A detector is released from rest over a source of sound of frequenc...

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A detector is released from rest over a source of sound of frequency \( \mathrm{f}_{0}=10^{3} \mathrm{~Hz} \). The frequency observed by the detector at time t is plotted in the graph. The speed of sound in air is \( \left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(A) \( 330 \mathrm{~m} / \mathrm{s} \)
(B) \( 350 \mathrm{~m} / \mathrm{s} \)
(C) \( 300 \mathrm{~m} / \mathrm{s} \)
(D) \( 310 \mathrm{~m} / \mathrm{s} \)
\( \mathrm{P} \)
W
\( \mathrm{t}(\mathrm{s}) \)
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