Q

A survey ship receives an echo from the ocean floor after 2.5 s. If sound speed is 1200 m/s, what is the depth?

RRB Group-D 12/12/2018 (Shift-III) 2018
✓ Answer: D 1500 m
The sound makes a round trip: depth = vt/2 = 1200 × 2.5/2 = 1500 m.
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