224CHAPTER 21 21.47The distance between adjacent antinodes in a standing wave is 2λThus, ( )2 6.00 cm12.0 cm0.120 m===(), and 982.9410 m s=×0.120 m2.4510 Hzcf×21.48At Earth’s location, the wave fronts of the solar radiation are spheres whose radius is the Sun-Earth distance. Thus, from avav24IntensityArπ√√, the total power is 2211av2W41 340 41.4910m3.7410WmIntensityrππ×=×P2621.49From maxmax02EBtensityµ=Inand maxmaxEcB=, we find 2max02cBIntensity=Thus, ( )7260max
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