High microwave intensities can cause biological damage through heating of tissue

Question

High microwave intensities can cause biological damage through heating of tissue; a particular concern is cataract formation. The U.S. Food and Drug Administration limits microwave radiation near the door of a microwave oven to 5.0 mW/m2. The window in a particular oven door measures 40 cm by 17 cm and is covered with a metal screen to block microwaves. Assuming power leaks uniformly through the window area, what percent of the ovens 900-W microwave power can leak without exceeding the FDA standards?

Explanation / Answer

P = I*A = (5.0*10^-3)*(0.17*0.40) = 0.34*10^-3 W

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(0.34*10^-3/900) * 100 = % 3.78 * 10^-5

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