pe24f08 - Last updated: December 2, 2008 PHY 2054...

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Last updated: December 2, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 24) 1. Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where: (Conditions for Interference) a. the crest from one wave overlaps with the crest from the other. . b. the crest from one wave overlaps with the trough from the other. c. the troughs from both waves overlap. d. darkness cannot occur as the two waves are coherent. 2. Laser light sent through a double slit produces an interference pattern on a screen 3.00 m from the slits. If the second order maximum occurs at an angle of 12.0º, at what angle does the eighth order maximum occur? (Double-Slit Interference) a. No eighth order maximum occurs. b. 48.0º c. 56.3º d. Not enough information is given. 3. A Young’s double-slit apparatus is set up. A screen is positioned 1.60 m from the double slits, and the spacing between the two slits is 0.040 0 mm. The distance between alternating bright fringes is 1.42 cm. What is the light source wavelength? (Wavelength Measurement)
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pe24f08 - Last updated: December 2, 2008 PHY 2054...

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