Ch24 HW4 - 8 milliwatts. What is the magnitude of the...

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12/17/10 9:38 PM Ch24 HW4 F2010 Page 1 of 1 http://www.webassign.net/v4cgisacoreth@ncsu/student.pl?c=20101218023804sacoreth@ncsu6657124101 Current Score : 6 / 6 Due : Monday, November 29, 2010 11:25 AM EST 1. 2/2 points Question: MI3 24.5.X.009 In the vicinity of Earth's orbit around the Sun, the energy intensity of sunlight is about 1200 W/m 2 . What is the approximate magnitude of the electric field in the sunlight? (What you calculate is actually the "root-mean-square" or "rms" magnitude of the electric field, because in sunlight the magnitude of the electric field at a fixed location varies sinusoidally, and the intensity is proportional to E 2 .) 672.293 673 N/C 2. 2/2 points Question: MI3 24.5.X.010 A small laser used as a pointer produces a beam of red light 4 mm in diameter, and has a power output of
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Unformatted text preview: 8 milliwatts. What is the magnitude of the electric field in the laser beam? 489.675 490 N/C 3. 2/2 points Question: MI3 24.6.X.011 Since force is dp / dt , the force due to radiation pressure reflected off of a solar sail can be calculated as 2 times the radiative momentum striking the sail per second. In the vicinity of Earth's orbit around the Sun, the energy intensity of sunlight is about 1500 W/m 2 . What is the approximate magnitude of the pressure on the sail? (For comparison, atmospheric pressure is about 10 5 N/m 2 .) 1e-5 1.00e-05 N/m 2 Ch24 HW4 F2010 (Homework) Stefan Coreth PY 208, section 002M, Fall 2010 Instructor: Laura I. Clarke Web Assign The due date for this assignment is past. Your work can be viewed below, but no changes can be made....
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