A person burned a firecracker in front of a cliff and heard its echo 5 s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to

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Q: 115 (CDS-I/2023)
A person burned a firecracker in front of
a cliff and heard its echo 5 s after it
burst. The distance of the cliff from
the person, if the speed of the sound
is 340 m/s, is close to

question_subject: 

Science

question_exam: 

CDS-I

The total distance traveled by sound is speed × time = 340 m/s × 5 s = 1700 m. Since the echo takes 5 s for the round trip, the distance to the cliff is 1700 m / 2 = 850 m round trip, making it 1700 m both ways.