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Vi) ECHO:An echo is the repetition of the original sound from a source by reflection from some object. So during the construction a hall we differentiate or avoid the confusion between the original sound and its echo by using absorbing material. (vii) QUALITY OF SOUND :The quality of sound in a hall means that the speaker phones, microphone, and amplifier used in-the hall should work in a synchronised or coordinating manner. This is known as the fidelity. (viii) EXTRANEOUS NOISE :It is the outside noise that enters a hall.

3) A cinema hall has a volume of 6000m 3 and total surface absorption is 20 owu. Calculate reverberation time. SOLUTION Volume, V = 6000 m 3 Surface absorption Ias = 20 owu. 165x6000 20 T = 11 sec. Ans. 4) A cinema hall of 3500m 3 volume having a seating capacity for 600 person having the following material in it . \43\ Materials Sr. no. 1. 2. 3. 4. 5. 6. 2 owu/head Find out the reverberation time. SOLUTION :Given Volume, V = 3500 m 3 No. of audience accupying wooden seats = audience - wooden seats.

Iii) It vibrates within elastic limits so that Hook's law is always applicable. 12) A spring balance has a scale that reads from 0 to 50 kg. the length of the scale is 20 cm. 60 sec. What is the weight of the body? SOLUTION :- If m = 50 kg. 2 k = 2450 N/m \27\ The time period is given by. 60 sec . 60 .. 34 kg. 93 N Ans. CANTILEVER :"A beam fixed horizentally at one end and free to vibrate at the other end is called conti lever. " Let us take a weightless rod AB, fixed at point A with the help of a clamp and the other end B is free.

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