their brightness ratio is the ratio of the inverse of the square of their distances
bP / bQ = (dQ / dP)^2
ly = light years
Stars P and Q have the same luminosity, but P is 30 ly from Earth and Q is 40 ly from Earth. What is the ratio of their brightness as viewed from Earth?
2 answers
So it would be 900:1600
= 9:16?
= 9:16?