Question:
A boy riding on his bike is going towards east at a speed of $4 \sqrt{2} \mathrm{~m} \mathrm{~s}^{-1}$. At a certain point he produces a sound pulse of frequency $1650 \mathrm{~Hz}$ that travels in air at a speed of $334 \mathrm{~m} \mathrm{~s}^{-1}$. A second boy stands on the ground $45^{\circ}$ south of east from his. Find the frequency of the pulse as received by the second boy.
Solution:
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