Q. 845.0( 2 Votes )

At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is :

A. 12.2 m B. 17.2 m

C. 15.2 m D. 34.4 m

Answer :

At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is 17.2 m.

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