00:01
All right, so for this one, we have a satellite in space.
00:03
It's 550 kilometers away from the earth.
00:07
So capital, d, is our distance away that the source is.
00:11
It's being emitted with a power of 10 kilowatts.
00:15
And when it strikes the earth, it has a diameter of 1 ,500 meters, which would correspond to a radius of 750 meters.
00:30
And we need to figure out what is the rrfapter.
00:33
Strength of the electric field.
00:36
So to do this, we will use the double equivalency equation where s equals power divided by area, which is also equal to speed of light times epsilon not times the erms value squared.
01:03
Since all three of these are equal and we don't have any information on s, we can just get rid of that and we will use these two to find our erms squared...