The U.S. Food and Drug Administration limits the radiationleakage of microwave o
ID: 1740950 • Letter: T
Question
The U.S. Food and Drug Administration limits the radiationleakage of microwave ovens to no more than 5.0 mW/cm2 at a distanceof 2.00 in. A typical cell phone, which also transmits microwaves,has a peak output power of about 2.0 W. (a) Approximating the cell phone as a point source, calculatethe radiation intensity of a cell phone at a distance of 2.00 in.How does the answer compare with the maximum allowable microwaveoven leakage? (Answer as the ratio of cellphone power / microwavepower.) (b) The distance from your ear to your brain is about 2 in.What would 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.I have part A done and cannot figure out how to do partB. The U.S. Food and Drug Administration limits the radiationleakage of microwave ovens to no more than 5.0 mW/cm2 at a distanceof 2.00 in. A typical cell phone, which also transmits microwaves,has a peak output power of about 2.0 W. (a) Approximating the cell phone as a point source, calculatethe radiation intensity of a cell phone at a distance of 2.00 in.How does the answer compare with the maximum allowable microwaveoven leakage? (Answer as the ratio of cellphone power / microwavepower.) (b) The distance from your ear to your brain is about 2 in.What would 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.
I have part A done and cannot figure out how to do partB.