Superimposed wave will be 6 beats per second
Intensity relation between maximum and minimum would be 9
f1 = 500
f2 = 506
Beat frequency= 506 - 500 = 6
Maximum intensity= 4+2 = 6= 6^2 =36
Minimum intensity= 4-2 = 2=2^2=4
Ratio=9
Superposition is a time where these two waves will collide or summed up.