PHYS 202 Midterm: PHYS 202 TAMU 202s09 Exam 4
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Note: the speed of light in air is c = 3. 00 x 108 ni/s. No work need be shown and no partial credit will be given. (5 pts) 1. A monochromatic beam of laser light passes through two very narrow parallel slits. The light passes through air to a screen that is 5. 0 iii from the slits. It is observed that near the center of the screen. adjacent bright fringes are separated by 1. 2 mm. The number of 2p states for a hydrogen atom is (a) zero (h) 3 (c) 5 (d) 6 (e) 7 (f) 10 (g) 14 (h) none of the above (5 pts) 4. Light falling on a metal surface causes electrons to he emitted from the metal by the photoelectric effect. As the wavelength of the light is decreased, the maximum kinetic energy of the photoelectrons (a) decreases (b) increases (c) stays the same (5 pts) 5.
