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Question

An oil – tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)


A

5.40

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B

4.47

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C

5.57

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D

6.40

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Solution

The correct option is B

4.47


Let the aircraft and the submarine be ‘x’ m above and below the tanker respectively. Time taken by sound to reach the aircraft is tair=x340s
Time taken by sound to reach the submarine twater=x1520=x1520s
Ratio of the time taken
tairtwater=(x340)(x1520)=1520340=4.47


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