A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms-1, what is the frequency of the clapping?
-
A.
1 Hz -
B.
2Hz -
C.
4Hz -
D.
8Hz
Correct Answer: Option A
Explanation
Total distance = 2 x 160 = 320cm
Total time = (frac{320}{320}) = 1s
F = (frac{1}{1}) = (frac{1}{1})
= 1Hz