Answer question: on the basis of your understanding of the following paragraph and the related st...

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Answer question: on the basis of your understanding of the following paragraph and the related studied concepts.
Like light waves, sound waves also get reflected when these fall on the surface of an obstacle. But unlike light waves, sound waves do not require polished surface for reflection, i.e., for reflection of sound waves, the surface may be polished or rough.
What is the condition for hearing a distinct echo ?

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