A bus is moving towards a huge wall with a velocity of \( 4 \mathrm...

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A bus is moving towards a huge wall with a velocity of \( 4 \mathrm{~m} \mathrm{~s}^{-1} \). The driver sounds a horn of frequency \( 200 \mathrm{~Hz} \). What is the frequency of the beats heard by a passenger of the bus. Speed of sound in air \( =342 \mathrm{~m} \mathrm{~s}^{-1} \).
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