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: Option C
Explanation
t = \(\frac{2x}{v} = \frac{2 \times 80}{330} = 0.485s\)
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