A submarine emits a SONAR pulse, which returns from an obstacle underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?
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⏩ Time between transmission and detection of SONAR pulse, t= 1.02 s
Speed of sound in salt water, v= 1531 m/s
Distance of the cliff = d (say)
Then the distance travelled by the sound would be → 2d
But,
2d= Speed of the sound × time = vt
2d= 1531 × 1.02 m
d= 1531 × 1.02/2
=> d= 780.81 m. Ans.
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