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Unformatted text preview: Physics 6C HW#2 solution April 17, 2008 25.30 a) The index of refraction is n = c v . From this relation, we can write Snells law in terms of velocities. sin 2 sin 1 = v 2 v 1 2 = 90 at critical angle. sin(90 ) sin c = 1850 m/s 343 m/s c = sin 1 (0 . 185) = 10 . 7 b) Sound can be totally reflected if it is traveling in the medium where it travels slower. air . c) Sound in air falling on the wall from the most di rection is totally reflected. Thus, the wall is a good mirror. 1 25.53 a) For polystyrene surrounded by air, the critical angle 3 is, 3 = sin 1 ( 1 . 00 1 . 49 ) = 42 . 2 From geometry, 2 = 90  3 = 47 . 8 3 is the minimum angle of total internal reflection when it is the critical angle. Since 2 = 90  3 , 2 becomes the maximum when the 3 is the minimum and 1 is the maximum as well. The maximum 1 can be found from Snells law....
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 Spring '01
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 Physics, Thermodynamics, Light

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