971_Physics ProblemsTechnical Physics

971_Physics ProblemsTechnical Physics - 312 *P34.67...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
312 Electromagnetic Waves *P34.67 (a) mV r == ρρπ 1 2 4 3 3 r m = F H G I K J = F H G G I K J J = 6 4 687 990 4 0161 13 ρπ π . . kg kg m m 3 bg ej (b) Ar = 1 2 4 2 0 161 0 163 2 2 ππ .. m m 2 af (c) IeT × = σ 48 4 0970567 10 304 470 . . Wm K K Wm 24 2 (d) P = IA 470 0 163 76 8 m W 22 (e) I E c = max 2 0 2 µ Ec I max × × = 2 8 10 3 10 470 595 0 12 78 µπ e j e j Tm A m s W m N C 2 (f) B max max = B max . = × = 595 31 0 198 8 NC ms T (g) The sleeping cats are uncharged and nonmagnetic. They carry no macroscopic current. They are a source of infrared radiation. They glow not by visible-light emission but by infrared emission. (h) Each kitten has radius r k = × F H G I K J = 608 990 4 00728 . . m and radiating area 20 0 7 2 8 0 0 3 3 3 2 m 2 = . Eliza has area 2 655 990 4 0120 23 . . × F H G I K J = m 2 . The total glowing area is 0 120 4 0 033 3 0 254 . m m 2 += and has power output = IA 470 0 254 119 m W P34.68 (a) At steady state, PP in out = and the power radiated out is out = eAT 4 . . Thus, 0 900 1 000 0 700 5 67 10
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

Ask a homework question - tutors are online