1. (a) A light ray incident on asmooth surface makes an angle 60 o with the surf

Question

1.      (a) A light ray incident on asmooth surface makes an angle 60o with the surface. Whatis the angle reflection?

(b) A 2.00H inductor is placed in series with a 60.0W resistor.What in the time constant of the circuit in second?

(c) A plano-convex lens is made of glass (n=1.5) with onesurface flat and the other having a radius of 20 cm. what is thefocal length of the lens?

(d) A sodium surface is bombarded by photons that have awavelength of 200nm. Find the energy of the photons. (h=6.62x10-34J.s, 1eV = 1.602x10-19 J, c =3x108 )

Explanation / Answer

. Hence angle of reflection = 60o   . (b) For LR - circuit ; .    Time constant is : = L / R = 2.00 H / 60.0 W = ------ . (c) We have : 1 / f = ( n - 1 )/ R = ( 1.5 - 1 ) / 20 .    or f = 20 / 0.5 = 40 cm . (d) Energy E = h c/ .       = ( 6.62 * 10-34  *3 * 108 ) / 200 * 10-9   .       = 9.93 *10-19   J .       = 9.93 *10-19  / 1.602 *10-19   eV .       = 6.19 eV . Hope this helps u!

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