A typical cell phone conveys microwaves having peak output power of around 2 W. When you suppose the cell phone is a point source, determine what would be radiated power at your brain 5 cm away from it? Determine how much would the power be decreased when you employed a Bluetooth headset which radiates 2.5 mW, and you kept the cell phone in your pocket 1m away from your head? Which puts more radiation in your brain the phone in your pocket or the Bluetooth headset in your ear?