Suppose that in an attempt to increase range, a cordless telephone manufacturer doubles the power output of its transmitters. Assume the power density is inversely proportional to the fourth power of distance in a cluttered home environment.

A: The useful range, without interference, is 50m before the power increase. What is it after the increase?

B: If the interference from other portable phones is based on the distance, is the level of interference more, less, or the same for:

i. Portable phone operating at the old power level but power density is inversely proportional to the fourth (not second) power of the distance? Explain.

ii. Operating at the new high power level? Explain.