What is the minimum reflecting surface size or distance needed to hear a clear echo?

Type: MCQ • Marks: 1

A. Must be sufficiently large and distant (>17.2 m in air)

B. Inside closed ears

C. Zero distance

D. Can be microscopic

Explanation

Reflectors must be large and at least ~17.2 meters away in air to prevent echo overlap with original sound.

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Class 9th Science (MCQ)

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