The electric field of a plane electro magnetic wave, propagating along z-axis is given byE=2 sin 8π x 1014t-8π3 x 106zv/mThen average intensity of the wave is
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a
8.16 mW/m2
b
5.31 mW/m2
c
12.28 mW/m2
d
28.14 mW/m2
answer is B.
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Detailed Solution
I=12ε0Em2.C =12 x 8.85 x 10-12 x (2)2 x 3 x 108 W/m2 =5.31 mW/m2