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Echo

If a house is...

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If a house is not filled with objects like, cushions,curtains etc. There is a echo or a reverberation

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Q. What is the difference between reverberation and echo?

T_{1}, T_{2}, T_{3}

be the reverberation times for an empty auditorium, when the hall has wounded curtains, and when curtains are made to unwound respectively. Arrange the reverberation times in ascending order.

Q. What is the major difference between echo and reverberation?

Q. In an auditorium the big curtain when falls suddenly then the reverberation time

Q. An auditorium of dimensions

(100 \times 40 \times 10) m^{3}

1000 m^{2}

curtains of absorption coefficient

0.2 m^{- 2}, 2000 m^{2}

of carpets of absorption coefficient

0.7 m^{- 2}

1000

men of absorption coefficients

0.9

per person are sitting in the hall, then reverberation time is

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