What is the minimum distance for hearing a distinct echo in air?

Type: MCQ • Marks: 1

A. About 0.17 m

B. About 1.7 m

C. About 172 m

D. About 17.2 m

Explanation

At 340 m/s and 0.1 s persistence of hearing, distance = 340 × 0.1 / 2 = 17.2 m.

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Class 9th Science (MCQ)

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