Which of the following best explains why an echo is heard when a sound is produced near a large, flat wall?

Question

Which of the following best explains why an echo is heard when a sound is produced near a large, flat wall? — Exam MCQ

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D. Sound waves reflect off the wall and return to the listener after a short delay. — The correct choice is Sound waves reflect off the wall and return to the listener after a short delay.. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

rrbjepyq.in · Answer

A. Sound waves pass directly through the wall and reappear on the other side.

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B. The wall vibrates and produces a new sound identical to the original.

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C. Sound is absorbed by the wall and then emitted slowly.

Which of the following best explains why an echo is heard when a sound is produced near a large, flat wall?

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