Type I Supernovae Have an Absolute Magnitude of -20

question 61

Multiple Choice

Type I supernovae have an absolute magnitude of -20.If you discover a Type I supernovae in a distant galaxy that has an apparent magnitude of 22,then how far away is this galaxy?

• A) 0.3 Mpc
• B) 40 Mpc
• C) 1,200 Mpc
• D) 2,500 Mpc