Q 11. The velocity of ultrasonic sound in water is 1400 ms-1. The depth of the oceans as detected by SONAR, if the time interval between transmission and receiving of ultrasonic wave is 15 s, is
(A) 14 km          (B) 10.5 km
(C) 105 m          (D) 1500 m

Dear student,

Speed=DistanceTimeDistance=speed×timeD=1400×15=21000mBut this is twice the distance of the depth as the ray is transmitted and then reflected.So the depth of the ocean=210002=10500m=10.5km

So option B is correct.

Regards

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