A handheld cellular telephone operates in the 860- to 900-MHz band and has a pow

Question

A handheld cellular telephone operates in the 860- to 900-MHz band and has a power output of 0.500 W from an antenna 10.0 cm long.


(a) Find the average magnitude of the Poynting vector 4.40 cm from the antenna, at the location of a typical person's head. Assume that the cell phone is on and that the antenna is emitting energy with cylindrical wave fronts. (The actual radiation from antennas follows a more complicated pattern.)
I1 = W/m2

(b) The ANSI/IEEE C95.1-1991 maximum exposure standard is 0.57 mW/cm2 (I2) for persons living near cellular telephone base stations, who would be continuously exposed to the radiation. Compare the answer from part (a) with this standard.
I1 / I2 = ?

Explanation / Answer

http://minerva.union.edu/labrakes/Light_Solutions.pdf

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