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Mechanical Properties of Fluids
Question
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A boy stands between two vertical walls, near to one wall when he claps his hands together, the echo of handclap continues for a few seconds with decreasing loudness. Why?

Answer

Echo continues for some time due to multiple reflections of sound from two walls. The decreasing loudness is due to the absorption of sound by walls.

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Some More Questions From Mechanical Properties of Fluids Chapter

What is sound?

How sound is produced?

Can sound travel in vacuum?

Can two persons hear each other on the moon? Explain.

Can electromagnetic wave propagate in vacuum?

Can we listen in vacuum?

Which of the two moves forward during wave motion - particle or disturbance?

What type of wave is sound wave when it travels in air?

What type of wave is sound wave when it travels in solids?

Which of the two - sound or light is longitudinal in nature?