Alternating Current Circuits and Electromagnetic Waves22721.57()DCDC12.0 V19.0 0.630 AVRI∆===Ω22rmsrms24.0 V242.1 0.570 AVZRfLIπ∆=+===ΩThus, 22242.1 19.0 9.9610H99.6 mH2260.0 HzLfππ−Ω−Ω−===×=21.58Suppose you cover a 1.7 m-by-0.3 m section of beach blanket. Suppose the elevation angle of the Sun is 60°. Then the target area you fill in the Sun’s field of view is ( )( )21.7 m0.3 m cos300.4 m°=. The intensity the radiation at Earth’s surface is surfaceincoming0.6II=and only 50% of this is absorbed. Since ( )avEtIAA∆∆P, the absorbed energy is ( )()surfaceincoming0.50.5 0.60.50.6
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