Two incoherent EM waves of intensities 7I0 and 13I0 travel in the same direction in the same region of space. What is the intensity of EM radiation in this region?
The Attempt at a Solution
I have tried using I = I1 + I2 + ( 2* square root of (I1 * I2))
also tried using the same equation with a minus sign in front of the () portion.
I am lost at what I need to do even some hints would be so great!