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Unformatted text preview: ------------------------------------------------------------------------------MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science Problem Set No. 3 6.630 Electromagnetic Theory Issued: Fall Term 2006 Due: Reading assignment: Section 1.4-1.5, 1.9 ; J. A. Kong, “Electromagnetic Wave Theory,” EMW, 2005. Problem P3.1 The Earth receives over all frequency bands about 1.5kW/m2 of power from the Sun. (a) The Earth-Sun distance is 150 ×109 m . How long does it take the sunlight to reach the Earth? (b) The Earth radius is 6400 km. What is the total power received by the Earth? (c) Assume the Sun’s mass is 2 ×1030 kg which converts to radiated energy according to mc2 at 1 percent efficiency. How long can the Sun radiate at the present level? (c) The Sun radiates 10−20 Wm−2 Hz−1 at 3GHz.Assuming constant power level over 1GHz bandwidth, what is the Poynting power density and the corresponding electric field amplitude?...
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This note was uploaded on 12/02/2010 for the course ECE 6.641 taught by Professor Zahn during the Spring '09 term at MIT.

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ps3 -...

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