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Unformatted text preview: Phys 100 Fall 2011 Concepts of Physics: Class Test III 28 November 2011 Name: Total: /50 Instructions There are 9 questions on 5 pages. Show your reasoning and calculations and always justify your answers. Physical constants and useful formulae speed = distance traveled time elapsed s = d t speed of light = wavelength frequency c = f frequency = speed of light wavelength f = c photon energy = 6 . 6 10- 34 frequency E = 6 . 6 10- 34 f photon frequency = photon energy 6 . 6 10- 34 f = E 6 . 6 10- 34 particle wavelength = 6 . 6 10- 34 mass speed = 6 . 6 10- 34 m v position range velocity range 6 . 6 10- 34 mass x v 6 . 6 10- 34 m Speed of light: c = 3 . 10 8 m/s Question 1 Light travels toward an arrangement of barriers and slits as illustrated. The intensity profile of the light on the screen is as illustrated. Three points are marked on the screen. Which of the following (choose one) is true? Barrier/slits Screen A B C a) Each photon that hits the screen moves from left to right across the screen with a wavy pattern. b) Any photon that reaches the screen will hit the screen and move toward point B. c) Each photon that hits the screen arrives at point A and also point B and also point C....
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- Fall '11