alleryA ship sends an ultrasonic pulse and receives its echo 4 s later. At 341 m/s, what is the obstacle distance?
A682 metres
B85.25 metres
C341 metres
D1,364 metres
Answer & Solution
Correct answer: A. 682 metres
The pulse covers a round trip of 341 × 4 = 1,364 m, so the obstacle is 682 m away.
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