By Yu.V. Egorov, A.I. Komech, M.A. Shubin, P.C. Sinha

This ebook, the 1st printing of which used to be released as quantity 31 of the Encyclopaedia of Mathematical Sciences, includes a survey of the trendy idea of common linear partial differential equations and an in depth evaluation of equations with consistent coefficients. Readers should be drawn to an advent to microlocal research and its functions together with singular indispensable operators, pseudodifferential operators, Fourier indispensable operators and wavefronts, a survey of crucial effects concerning the combined challenge for hyperbolic equations, a overview of asymptotic equipment together with brief wave asymptotics, the Maslov canonical operator and spectral asymptotics, an in depth description of the purposes of distribution concept to partial differential equations with consistent coefficients together with a number of attention-grabbing distinctive issues.

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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.