Q8. The speed of sound in water is 1500 m/s. How far away from an under sea rock should a deep sea diver be, so that he can hear his own echo?The diver hears echo in 3 second.
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Speed of sound in water is given as 1500 m/s. Here, the sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1 s. Hence, the total distance covered by the sound from the point of generation to the reflecting surface and back = 1500 * 0.1 = 150 m.
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