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957_Physics ProblemsTechnical Physics

# 957_Physics ProblemsTechnical Physics - 298*P34.18...

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298 Electromagnetic Waves *P34.18 (a) I E c == × ×⋅ × F H G I K J F H G I K J ⋅⋅ F H G I K J F H G I K J max 2 0 6 2 78 2 2 31 0 24 10 3 10 µ π ±Vm TmA ms J VC C As TCm Ns Nm J ej e j I 119 10 10 . W m 2 (b) P == × × F H G I K J IA 51 0 234 10 10 3 2 5 .. Wm m 2 W 2 P34.19 (a) EB i j k i j k ⋅= + + + 80 0 32 0 64 0 0 200 0 080 0 0 290 . ± . ± . ± . ± . ± . ± bg NC T + ⋅ = 16 0 2 56 18 56 0 . af NsCm 22 (b) SE B ijk i j k = +− × + + 1 80 0 32 0 64 0 0 200 0 080 0 0 290 41 0 0 7 . ± . ± . ± . ± . ± . ± e j T S kjkiji = −− +−+ × × 6 40 23 2 6 40 9 28 12 8 5 12 10 0 6 7 . ± . ± . ± . ± . ± . ± ±Wm 2 Si j =− = 11 5 28 6 30 9 . ± . ± . at −° 68 2 . from the + x axis. *P34.20 The energy put into the water in each container by electromagnetic radiation can be written as et e I A t ∆∆ = where e is the percentage absorption efficiency. This energy has the same effect as heat in raising the temperature of the water: eIA t mc T Vc T T eI t c eI t c ρ A A A 2 3 where A is the edge dimension of the container and c the specific heat of water. For the small container, T = × ⋅° 0 7 25 10 480 006 4186
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