How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)
-
A.
36.67m -
B.
74.25m -
C.
148.50m -
D.
297.00 -
E.
366.67m
Correct Answer: Option C
Explanation
v = 2x/t ∴ distance x = vt/2 = 148.5m