The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms-1 the depth of the sea is
-
A.
6000m -
B.
3000m -
C.
1500m -
D.
375m
Correct Answer: Option B
Explanation
t = 4s ; v = 150ms-1
depth = X ; but 2X = vt
X = (frac {vt}{2}) = (frac {1500 times 4}{2})
X = 3000m