HW-26Solutions-04-07-08

# HW-26Solutions-04-07-08 - Lehigh University HW-26 Solutions...

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Lehigh University Physics 21, Spring 2008 April 7, 2008 HW-26 Solutions 26-1. (HRW 35-1) The speed of yellow light (from a sodium lamp) in a certain liquid is measured to be . What is the index of refraction of this liquid for the light? Solution: 1. The index of refraction is found from Eq. 35-3: n c v == × × = 2 998 10 192 10 156 8 8 . . .. ms 26-2. (HRW 35-9) Suppose that the two waves in Fig. 35-4 have wave length in air. What multiple of gives their phase difference when they emerge if (a) n 1 = 1.50, n 2 = 1.60, and ; (b) n 1 = 1.62, n 2 = 1.72, and ; and (c) n1 = 1.59, n 2 = 1.79, and ? (d) Suppose that in each of these three situations the waves arrive at a common point (with the same amplitude) after emerging. Rank the situations according to the brightness the waves produce at the common point. Solution: 9. (a) Eq. 35-11 (in absolute value) yields L nn λ 21 6 9 850 10 500 10 160 150 170 −= × × . . . m m ch b g (b) Similarly, L λ 6 9 500 10 172 162 × × . . . m m b g (c) In this case, we obtain L λ 6 9 325 10 500 10 179 159 130 × × .

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HW-26Solutions-04-07-08 - Lehigh University HW-26 Solutions...

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