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Unformatted text preview: Questions W denotes answer available in Student SolutionsManual/Study Guide; O denotes objective question Question 4 in Chapter 18 may be assigned with this chapter. 1. What is the necessary condition on the path length difference between two waves that interfere (a) constructively and (b) destructively? 2. Explain why two flashlights held close together do not produce an interference pattern on a distant screen. 3. O Four trials of Young’s double-slit experiment are conducted. (a) In the first trial, blue light passes through two fine slits 400 μ m apart and forms an interference pattern on a screen 4 m away. (b) In a second trial, red light passes through the same slits and falls on the same screen. (c) A third trial is performed with red light and the same screen, but with slits 800 μ m apart. (d) A final trial is performed with red light, slits 800 μ m apart, and a screen 8 m away. (i) Rank the trials (a) through (d) from largest to smallest value of the angle between the central maximum and the first-order side maximum. In your ranking, note any cases of equality. (ii) Rank the same trials according to the distance between the central maximum and the first-order side maximum on the screen. 4. Suppose you blow smoke into the space between the barrier and the viewing screen in Young’s double- slit experiment, shown in Active Figure 37.2a. Would the smoke show evidence of interference within this space? Explain your answer 5. O Suppose Young’s double-slit experiment is performed in air using red light and then the apparatus is immersed in water. What happens to the interference pattern on the screen? (a) It disappears. (b) The bright and dark fringes stay in the same locations, but the contrast is reduced. (c) The bright fringes are closer together. (d) The color shifts toward blue. (e) The bright fringes are farther apart. (f) The bright fringes are in continuous motion. (g) No change happens in the interference pattern. 6. In Young’s double-slit experiment, why do we use monochromatic light? If white light is used, how would the pattern change? 7. O Suppose you perform Young’s double-slit experiment with the slit separation slightly smaller than the wavelength of the light. As a screen, you use a large half-cylinder with its axis along the midline between the slits. What interference pattern will you see on the interior surface of the cylinder? (a) bright and dark fringes so closely spaced as to be indistinguishable (b) one central bright fringe and two dark fringes only (c) a completely bright screen with no dark fringes (d) one central dark fringe and two bright fringes only (e) a completely dark screen with no bright fringes 8. As a soap bubble evaporates, it appears black immediately before it breaks, as at the top of the circular film shown in Figure Q37.8. Explain this phenomenon in terms of the phase changes that occur on reflection from the two surfaces of the soap film....
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This note was uploaded on 05/22/2010 for the course PHYS 2326 taught by Professor Staff during the Summer '08 term at HCCS.
- Summer '08