A boy stands in between two parallel cliffs and explodes a cracker. He hears the first echo after 0.5s and second echo 1.8s after listening to the first echo. Calculate the distance between the cliffs if speed of sound in air is 356 m s-1
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Given A boy stands in between two parallel cliffs and explodes a cracker. He hears the first echo after 0.5 s and second echo 1.8 s after listening to the first echo. Calculate the distance between the cliffs if speed of sound in air is 356 m s-1
- Given a boy stands in between two parallel cliffs and bursts a cracker.
- So let P and Q be the two cliffs at a distance d1 and d2 meter from the boy.
- Given for d1, v = 356 m/s, t = 0.5 s
- So for d2, v = 356 m/s, t = 1.8 s
- So we have d1 = v x t / 2
- = 356 x 0.5 / 2
- = 178 / 2
- = 89 m
- Also we have d2 = v x t / 2
- = 356 x 1.8 / 2
- = 640.8 / 2
- = 320.4
- So distance PQ = d1 + d2
- = 89 + 320.4
- = 409.4 m
Reference link will be
brainly.in/question/1468067
brainly.in/question/1743681
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