Physics
JAMB 1983
A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms
-1, how much closer is the ship to the cliff?
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A.
10m
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B.
125m
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C.
175m
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D.
350m
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E.
1,000m
Correct Answer: Option B
Explanation
Difference in time = 1 sec.
echo time = 1 \(\div\) 2 = 0.5 sec.
= 0.5 x 250
= 125m
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