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Problems 1197 What is the necessary condition on the path length differ- 2. Explain why two flashlights held close together do not produce an interference pattern on a distant screen. 3. If Young’s double-slit experiment were performed under water, how would the observed interference pattern be 5. A simple way to observe an interference pattern is to look at a distant light source through a stretched handkerchief 6. A certain oil film on water appears brightest at the outer regions, where it is thinnest. From this information, what 7. As a soap bubble evaporates, it appears black just before it breaks. Explain this phenomenon in terms of the phase 8. If we are to observe interference in a thin film, why must the film not be very thick (with thickness only on the order 9. A lens with outer radius of curvature R and index of refrac- tion n rests on a flat glass plate. The combination is 4. 1. illuminated with white light from above and observed from 10. Why is the lens on a good-quality camera coated with a thin film? 11. Why is it so much easier to perform interference experi- ments with a laser than with an ordinary light source? 12. Suppose that reflected white light is used to observe a thin transparent coating on glass as the coating material is 13. In our discussion of thin-film interference, we looked at light reflecting from a thin film. What If? Consider one light 14. Suppose you are watching television by connection to an antenna rather than a cable system. If an airplane flies Q U E S T I O N S Section 37.1 Conditions for Interference 1. A laser beam (& # 632.8 nm) is incident on two slits 0.200 mm apart. How far apart are the bright interference 2. A Young’s interference experiment is performed with monochromatic light. The separation between the slits Two radio antennas separated by 300 m as shown in Figure P37.3 simultaneously broadcast identical signals at 3. Note: Problems 8, 9, 10, and 12 in Chapter 18 can be 1, 2 , 3 = straightforward, intermediate, challenging = full solution available in the Student Solutions Manual and Study Guide = coached solution with hints available at http://www.pse6.com = computer useful in solving problem = paired numerical and symbolic problems P R O B L E M S 400 m 1000 m 300 m Figure P37.3 |