The U.S. Food and Drug Administration limits the radiationleakage of microwave o
ID: 1764373 • Letter: T
Question
The U.S. Food and Drug Administration limits the radiationleakage of microwave ovens to no more than 5.0 mW/cm2 ata distance of 2.00 in. A typical cell phone, which also transmitsmicrowaves, has a peak output power of about 2.0 W. (a) Approximating the cell phone as a pointsource, calculate the radiation intensity of a cell phone at adistance of 2.00 in. How does the answer compare with the maximumallowable microwave oven leakage? (Answer as the ratio of cellphonepower / microwave power.)(b) The distance from your ear to your brain is about 2 in. Whatwould the radiation intensity in your brain be if you used aBluetooth headset, keeping the phone in your pocket, 1.0 m awayfrom your brain? Most headsets are so-called Class 2 devices with amaximum output power of 2.5 mW.
The U.S. Food and Drug Administration limits the radiationleakage of microwave ovens to no more than 5.0 mW/cm2 ata distance of 2.00 in. A typical cell phone, which also transmitsmicrowaves, has a peak output power of about 2.0 W. (a) Approximating the cell phone as a pointsource, calculate the radiation intensity of a cell phone at adistance of 2.00 in. How does the answer compare with the maximumallowable microwave oven leakage? (Answer as the ratio of cellphonepower / microwave power.)
(b) The distance from your ear to your brain is about 2 in. Whatwould the radiation intensity in your brain be if you used aBluetooth headset, keeping the phone in your pocket, 1.0 m awayfrom your brain? Most headsets are so-called Class 2 devices with amaximum output power of 2.5 mW.
(a) Approximating the cell phone as a pointsource, calculate the radiation intensity of a cell phone at adistance of 2.00 in. How does the answer compare with the maximumallowable microwave oven leakage? (Answer as the ratio of cellphonepower / microwave power.)
(b) The distance from your ear to your brain is about 2 in. Whatwould the radiation intensity in your brain be if you used aBluetooth headset, keeping the phone in your pocket, 1.0 m awayfrom your brain? Most headsets are so-called Class 2 devices with amaximum output power of 2.5 mW.