The energy flow per unit time per unit area (S) of an electromagnetic wave has o

Question

The energy flow per unit time per unit area (S) of an electromagnetic wave has on average value of 600 mW/m^2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. The total energy that traverses the area in a time interval of one minute is closest to: A beam of light is linearly polarized in a vertical plane and has an intensity I_o. The beam passes through an id and then through an ideal analyzer whose axis is set horizontally. In Situation 23.4, the axis of the polarizer is set at 40 degree with the vertical. The ratio of the electric field in the final beam to that of the initial beam is closest to:

Explanation / Answer

9)

S = 600 x 10-3 W /m2

E = S x A x t = 600 x 10-3 x 1.5 x 2 x 60 = 110 J

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