A SONAR system fixed in a submarine operates at a frequency \( 40.0...

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A SONAR system fixed in a submarine operates at a frequency \( 40.0 \mathrm{kHz} \). An enemy submarine moves towards the SONAR with a speed of \( 360 \mathrm{~km} \mathrm{~h}^{-1} \). What is the frequency of sound reflected by the submarine ? Take the speed of sound in water
\( P \) to be \( 1450 \mathrm{~m} \mathrm{~s}^{-1} \).

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