A. atmospheric pressure is higher at the surface than at the higher altitudes
B. speed of sound is less than that of light
C. temperature of the atmosphere decreases with altitude
D. atmospheric density decreases with altitude
Correct Answer: Option B
B. speed of sound is less than that of light
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![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]")