1. (a) A light ray incident on asmooth surface makes an angle 60 o with the surf
ID: 1727486 • Letter: 1
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!Related Questions
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