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Unformatted text preview: pokharel (yp624) – HW09 – TSOI – (92515) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points A helium-neon laser intended for classroom produces 1 . 4 mW of light power. At a point where the cross section of the beam has an area of 9 . 4 mm 2 , what is the maximum value of the electric field E ? The permeability of free space is 1 . 25664 × 10 − 6 N / A 2 and the speed of light is 2 . 99792 × 10 8 m / s. Answer in units of N / C. 002 (part 2 of 3) 10.0 points What is the electromagnetic energy in a beam of length 2 . 7 m? Answer in units of J. 003 (part 3 of 3) 10.0 points What is the corresponding momentum of the beam? Answer in units of J · s / m. 004 (part 1 of 2) 10.0 points Lasers have been used to suspend spherical glass beads in the Earth’s gravitational field. A bead has a mass of 3 μ g and a density of . 7 g / cm 3 . The laser beam is larger than the glass bead with a radius 474 μ m and fully impinges on the bead. Assume complete absorption.absorption....
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This note was uploaded on 09/25/2010 for the course PHYS 302L taught by Professor Tsoi during the Spring '10 term at University of Texas.
- Spring '10