A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms-1, how long would it take for her to hear the echo of the sound?
A
2.062s
B
0.970s
C
0.485s
D
0.242s
Verified Correct Answer: C.
Physical Principles & Numerical Solution
t = \(\frac{2x}{v} = \frac{2 \times 80}{330} = 0.485s\)
Source: Myschool Past Questions Archive (Record #34364)