By Manoj Kumar

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The area of reflecting surface in square metre. = as The total absorptions of the surface of different materials. where a p a 2 , a 3 ------a n are the absorption coeffiecient of different materials ans 81' 8 2 , 8 3 ------8 n are their respective areas in square metres. METHOD TO CONTROL REVERBERATION TIME :The fOllowing methods can be followed to control the reverberation time ;(i) By using open windows, as open windows are the perfect absorbers of sound energy. (ii) By using a sound absorbeing material like absorb sheets, card boards, on the walls of the room.

Relation between wavelength A, frequency n, and wave velocity v is v=A ( a) n (c) vA=l v (b) n A= (d) vA=n 5. What types of waves required material medium? (a) Sound wave (b) Light wave Current (d) None of these. (c) 6. Velocity of a light wave is 7. 8. (a) 332 m/sec. (b) 3x 10 8 m1sec. (c) 3 xl 0-8 m/sec. (d) -332 m/sec. (b) (d) 3 x 10-8 m/sec. -332 m/sec. Velocity of a sound wave is (a) 3x 108 m/sec. (c) 332 m/sec. Elastic waves in a solids are (a) Transverse (b) (c) Neither transverse nor longitudnal None of these.

The loudness of sound dep . vis upon the intensity of the sound at a place and the sensativeness of the ear of the listener. The unit ofloudnes" IS "BEL" (B) The lowest intensity of sound that can be perceived by the human ear is called threshold of hearing. It is denoted by 10. and its value is 10- 12 watt 1m 2 The loudness of a sound of intensity I is given by L = 1 loglo -I ---------------(1) () Where 10 is threshold of hearing. If I = 1010 then, 101 L = lOglO _ _0 = 1 bel. I() Thus the loudness ofa sound is said to be 1 bel if the intensity is 10 times that of the threshold of hearing.