A girl stand 80m away from a tall cliff and blows a whistle. If the...
PHYSICS
WAEC 2004
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
Correct Answer: C. 0.485s
Explanation
t = \(\frac{2x}{v} = \frac{2 \times 80}{330} = 0.485s\)
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