A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms−¹; calculate the distance between the layers.
A. 200 m
B. 400 m
C. 2400 m
D. 2600 m
E. 2800 m
Correct Answer:
Option A = 200 m
Explanation
X = Δvt/2 = {(2000×14)2 – (2000×12)2} = 200 m.
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![A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms‾¹]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms‾¹]")