In a suspense-thriller movie two submarines x and y, Ask an Expert

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In a suspense-thriller movie, two submarines, X and Y, approach each other, traveling at 11 m/s and 20 m/s, respectively. Submarine X "pings" submarine Y by sending a sonar wave of frequency 1920 Hz. Assume that the sound travels at 1500 m/s in the water.

How much is the Doppler shift?

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