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# hw09 - Phys 100 Fall 2011 Concepts of Physics Homework 9...

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Phys 100 Fall 2011 Concepts of Physics: Homework 9 Due: 9 November 2011 In order to receive full credit, you must show all work, calculations and provide complete reasons and explanations for your solutions. 1 Hobson, Physics: Concepts and Connections, 5ed Ch. 12 Conceptual Exercise 6, page 292. 2 Hobson, Physics: Concepts and Connections, 5ed Ch. 12 Conceptual Exercise 10, page 292. 3 Hobson, Physics: Concepts and Connections, 5ed Ch. 12 Conceptual Exercise 12, page 292. 4 Hobson, Physics: Concepts and Connections, 5ed Ch. 12 Problem 2, page 293. 5 Hobson, Physics: Concepts and Connections, 5ed Ch. 12 Problem 8, page 293. 6 Photons produced by laser light A typical low powered laboratory laser has a power of 5 mW (i.e. produces 0 . 005 J per second). Suppose that such a laser produces a pulse of light of duration 0 . 025 s (this is quite normal). a) If the wavelength of the light is 632 nm , determine the frequency of the light and the energy of each photon. b) Determine the total number of photons contained in the pulse.

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