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Quiz_6_sol

# Quiz_6_sol - Quiz6 Problem 1 In a two-slit interference...

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Quiz6 Problem 1 In a two-slit interference experiment, the path length to a certain point P on the screen differs for one slit in comparison to other by 1 .25 λ . (a) What is the phase difference between the two waves arriving at point P ? (b) Determine the intensity at P , expressed as a function of the maximum intensity I 0 on the screen. Solution : (Ch 34, problem # 20) a) The phase difference is given in Eq. 34-4. We are given the path length difference, dsinθ. . 5 . 2 25 . 1 2 sin 2 π δ θ = = = d b) The intensity is given by Eq. 34-6. ( 29 0 2 0 2 0 500 . 0 25 . 1 cos 2 cos I I I I = = = Problem 2 Light of wavelength 690 nm passes through two narrow slits 0.66 mm apart. The screen is 1.6 m away. A second source of unknown wavelength produces its second order fringe 1.23 mm closer to the central maximum than the 690-nm light. What is the wavelength of the unknown light? (Hint: Use approximation of small angles s in θ≈ tan θ≈θ ) Solution:

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Quiz_6_sol - Quiz6 Problem 1 In a two-slit interference...

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