A person burned a firecracker in front of a cliff and heard its echo 5s after it burst. The distance of the cliff from the person, if the speed of the sound is 340~m/s, is close to
- A. 1700 m
- B. 170 m
- C. 85 m
- D. 850 m ✓
Correct Answer: D. 850 m
Explanation
The sound travels to the cliff and back, covering twice the distance. Distance d = \frac{v \times t}{2} = \frac{340 \times 5}{2} = 850 m.
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