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Where and why sound absorbing materials are used?
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What is an echo? What factors are important to get distinct echo?
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We cannot hear an echo produced in a classroom.
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The intensity of reverberation is higher in a closed and empty house.
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The roof of a movie theatre and a conference hall is curved.
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Fill in the blanks and explain.
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difference between Principal Focus of Concave and Convex Mirror.
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What is a mirror ?
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What is light ?
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