Question

Estimate the power density radiating into your skull during a 1 minute cell phone conversation. Assume that the cell phone has an output power of 0.5 W and radiates that it emits the radiation spherically.

How much energy is transferred onto or into your skull?

How much momentum is transferred?

(There are certain things you need to find out to calculate this: What is the cross sectional area of your head? What is the wavelength of cell phone transmittance? How far from the head do you hold your cell phone?)

Cross sectional area of skull: 314cm^2

Wavelength of phone signal: ~30cm

2cm away from skull

Answer 1