A bat moving at 10 ms^(-1) towards a wal...

A bat moving at 1`0 ms^(-1)` towards a wall sends a sound signal of 8000 Hz towards it. On reflection it hears a sound of frequency f. The value of g in Hz is close to (speed to sound `= 320 ms^(-1)`) :

8258

8424

8000

8516

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