A stationary source is emitting sound at a fixed frequency \( f_{0} \), which is reflected by tw...

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A stationary source is emitting sound at a fixed frequency \( f_{0} \), which is reflected by two cars approaching the source. The difference between the frequencies of sound reflected from the
P cars is \( 1.2 \% \) of \( f_{0} \). What is the difference in the speeds of the

W cars (in km per hour) to the nearest integer ? The cars are moving at constant speeds much smaller than the speed of sound which is \( 330 \mathrm{~ms}^{-1} \).
(2010)
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