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

Subject: General Awareness | Topic: Science | Difficulty: MEDIUM

Options

1. (A) The listener must be moving
2. (B) The reflecting surface must be soft
3. (C) The source of sound must be very loud.
4. (D) The time interval must be at least 0.1 s

Verified Answer

Option (D): The time interval must be at least 0.1 s

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