HW 7

HW 7 - m 3 1609 mile 1 10 198 1 4 Hz 15 9 r m S = × =...

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11:1D Homework 7/ Fall 2004 Name:_____________________________ EE 3320 Due Wednesday, October 6, 2004 Please print this sheet out and do your work on it to hand in. 1. To shield a room from radio interference, the room must be enclosed in a layer of a certain material five skin-depths thick. If the minimum frequency to be shielded against is 20 kHz what should be the thickness of the copper (in millimeters)? For copper, o µ = , o ε = , and m S 7 10 4 × = σ . 2. The phase velocity of an EM wave can be calculated from β ω = p v . Calculate the phase velocity of an electromagnetic wave in seawater if the following values pertain:

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Unformatted text preview: m 3 . 1609 mile 1 , 10 198 . 1 , , 4 , Hz 15 9 r m S = × = ε′ µ = µ = σ = f Provide your answer in miles per hour (mph). 2. Assume that you are searching for an object that is buried 2.5 kilometers beneath the surface of the earth and you are using a high powered 1 MHz radar in your search effort. The soil below your radar is sandy and dry and you know that you can accurately probe up to three penetration depths under these conditions. Determine whether or not you could succeed in the effort. Use appendix C in your text as an aid and assume that . µ = µ...
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HW 7 - m 3 1609 mile 1 10 198 1 4 Hz 15 9 r m S = × =...

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