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Two submarines are approaching each othe...

Two submarines are approaching each other in a calm sea. The first submarine travels at a speed of `36 km h^-1` and the other at `54 km h^-1` relative to the water. The first submarine sends a sound signal (sound waves in water are also called sonar) at a frequency of 2000 Hz. (a) At what frequency is this signal received by the second submarine ? (b) The signal is reflected from the second submarine. At what frequency is this signal received by the first submarine. Take the speed of the sound wave in water to be `1500 m s^-1` .

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