Hi, I have done this problem multiple times and always seem to come up with the wrong answer.
Any help is greatly appreciated!
Scientists using the Hubble Space Telescope have observed Cepheids in the galaxy M 100. Here are the actual data for three Cepheids in M 100:
Cepheid 1: luminosity = 3.9 x 10^30 watts, brightness 9.3 x 10^-19 w/m^2
Cepheid 2: luminosity = 1.2 x 10^30 watts, brightness 3.8 x 10^-19 w/m^2
Cepheid 3: luminosity = 2.5 x 10^30 watts, brightness 8.7 x 10^-19 w/m^2
Compute the distance to M 100 with data from each of the three Cepheids in light-years (d1, d2, d3)