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Unformatted text preview: 3) The voltage of an electromagnetic wave traveling on a transmission line is given by ) 30 10 4 sin( 7 ) , ( 9 z t e t z v z π α − × = − a) Find the frequency, wavelength, and phase velocity of the wave. b) At z=2 m, the amplitude was measured to be 2 V. Find α . c) What is the amplitude of the wave measured at 10 m? 4) . A laser beam traveling through fog was observed to have an initial intensity of 1 ( μ W/m2). At a distance of 2 m from the laser it has an intensity of 0.2 ( μ W/m2). Given that the intensity of an electromagnetic wave is proportional to the square of its electric-field amplitude, find the attenuation constant α of fog. 5) 9) The voltage source of the circuit shown in the figure below is given by _ ) 45 10 4 cos( 24 ) ( 4 o − × = t t v Obtain an expression for i L ( t ), the current flowing through the inductor. 6) 7) 8)...
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This note was uploaded on 04/02/2010 for the course ECE ECE 107 taught by Professor Ericfullerton during the Spring '07 term at UCSD.
- Spring '07