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
Verified Correct Answer: A.
Physical Principles & Numerical Solution
Total distance = 2 x 160 = 320cm
Total time = \(\frac{320}{320}\) = 1s
F = \(\frac{1}{1}\) = \(\frac{1}{1}\)
= 1Hz
Source: Myschool Past Questions Archive (Record #28537)