Which of the following conditions is necessary to hear an echo clearly?

Question

Which of the following conditions is necessary to hear an echo clearly? — Exam MCQ

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A. Time interval must be at least 0.1 s — The correct choice is Time interval must be at least 0.1 s. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

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B. Source of sound must be very strong

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C. Listener must be moving

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D. The reflecting surface must be soft

Which of the following conditions is necessary to hear an echo clearly?

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