A traffic policeman standing on a road sounds a whistle emitting

Question:

A traffic policeman standing on a road sounds a whistle emitting the main frequency of $2.00 \mathrm{kHz}$. What could be the apparent frequency heard by a scooter-driver approaching the policeman at a speed of $36.0 \mathrm{~km} \mathrm{~h}^{-1}$ ? Speed of sound in air = $340 \mathrm{~m} \mathrm{~s}^{-1}$.

Solution:

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