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A speaker emits a sound wave of frequency \( f_{0} \). When it
\( \mathrm{P} \) moves towards a stationary observer with speed \( u \), the

W observer measures a frequency \( f_{1} \). If the speaker is stationary and the observer moves towards it with speed \( u \), the measured frequency is \( f_{2} \) then
[KVPY 2011]
(a) \( f_{1}=f_{2}=f_{0} \)
(b) \( f_{1}f_{2} \)
(c) \( f_{1}f_{2} \)
(d) \( f_{1}=f_{2}f_{0} \)
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