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A bus is moving with a velocity of $5 \mathrm{~m} / \mathrm{s}$ towards a wall. The driver blows the horn
of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of
sound wave, the number of beats per second heard by the passengers in the bus will be
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of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of
sound wave, the number of beats per second heard by the passengers in the bus will be
Solution:
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The correct answer is:
5
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