1.

An investigator team transmit an ultra sound signal to the sea bed. The signal is received back in 4 second. If the speed of sound in sea water is 1500 meter / second then the depth of sea is :(A) 3 km(B) 6 km(C) 4.5 kmD) 15 km.

Answer»

Correct option is (A) 3 km



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