NCERT 2022 | वनस्पति जगत - L1 | plant kingdom |Class 11 जीव विज्ञान |Hindi Medium | Pooja ma'm|11 AM

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Due to a point isotropic sonic source, loudness at a point is L = 40 dB. If density of air is r = 15//11 kg m^(-3) and velocity of sound in air, u = 330 ms^(-1) , calculate. (i) pressure oscillation amplitude at the point of observation, and (ii) ratio oscillation amplitude of particle of medium to wavelength of sonic waves.

Consider two points A=(1,2) and B=(3,-1). Let M be a point on the straight line L=x+y=0 If M be a point on the line L=0 such that |AM-BM| is maximum,then the distance of M from N=(1,1) is

Choose the true state1nents from the follovving: l. Birbal Sahni is called 'Father of lndian Palaeobotany . II. Pseudo-fossils are re.mains of plants and anjmals. III. C_(11) radioactive carbon method is used for dating not only for fossils, but also for archaeological remains IV. Coenozoic era is called 'nge of m,.unmals and birds'

Let f^(prime)(x)=(192 x^3)/(2+sin^4pix)fora l lx in Rw i t hf(1/2)=0.Ifmlt=int_(1/2)^1f(x)dxlt=M , then the possible values of ma n dM are (a)m=13 ,M=24 (b) m=1/4,M=1/2 (c)m=-11 ,M=0 (d) m=1,M=12