24_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

24_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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224 CHAPTER 21 21.47 The distance between adjacent antinodes in a standing wave is 2 λ Thus, ( ) 2 6.00 cm 12.0 cm 0.120 m == = () , and 98 2.94 10 m s = × 0.120 m 2.45 10 Hz cf × 21.48 At Earth’s location, the wave fronts of the solar radiation are spheres whose radius is the Sun-Earth distance. Thus, from av av 2 4 Intensity A r π √√ , the total power is 2 21 1 av 2 W 4 1 340 4 1.49 10 m 3.74 10 W m Intensity r ππ   × = ×     P 2 6 21.49 From max max 0 2 EB tensity µ = In and max max E c B = , we find 2 max 0 2 cB Intensity = Thus, ( ) 7 26 0 max
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