Which of the following is the cause of echo?

Q. Which of the following is the cause of echo?
Answer: When sound is reflected
Notes: If we shout or clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound which we hear is called an echo.

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📌 Question Number: 38 in Physics GK 16 - Sound Waves in the above course in App.