Question

The speeds of sound in air and sea-water are given to be 340 m/s and 1440 m/s. Resp. A ship sends a strong signal straight down and detects its echo after 1.5 secs. The depth of the sea at that point is

Answer 1

Let depth of sea be d
Distance covered by signal will be 2d
Speed= 1440m/s
Time taken= 1.5s
Speed= Distance/Time
Distance= Speed x Time = 1440 x 1.5 = 2160 m
2d = 2160
d = 2160/2 = 1080 m