HW28 - Platt, David Homework 28 Due: Nov 14 2005, 4:00 am...

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Unformatted text preview: Platt, David Homework 28 Due: Nov 14 2005, 4:00 am Inst: Ken Shih 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points In 1965 Penzias and Wilson discovered the cosmic microwave radiation left over from the Big Bang expansion of the universe. The energy density of this radiation is 9 . 44 10- 14 J / m 3 . The speed of light 2 . 99792 10 8 m / s and the permeability of free space is 4 10- 7 N / A 2 . Determine the corresponding electric field amplitude. Answer in units of V / m. 002 (part 1 of 1) 10 points Consider an electromagnetic plane wave with time average intensity 381 W / m 2 . The speed of light is 2 . 99792 10 8 m / s and the permeability of free space is 4 10- 7 T m / A . What is its maximum electric field? Answer in units of V / m....
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