A. 23m
B. 128m
C. 288m
D. 298m
Correct Answer: Option B
Explanation
V = 2nxE
= 2×1×X/0.8 = 320
2x = 0.8 x 320
x = 0.8×320/2
= 128m
![an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]")
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