An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in sea water. find the depth of the water if the time delay of the echo to the ocean floor and back is 5.95s.

1530*5.95/2

Explanation:

the waves traverse the depth twice before being received

time to reach the bed must be 5.95/2

hence depth = speed*time

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.