If the magnitude difference between one star and another is 7, the stars differ in brightness by a factor of
A) 2.51.
B) 18.
C) 6.
D) 628.

Question

Quizplus · Accepted Answer

The brightness difference between two stars is calculated using the formula $2.512^{(\text{magnitude difference})}$. For a magnitude difference of 7, the calculation is $2.512^7 \approx 628$, indicating that the stars differ in brightness by a factor of approximately 628.

If the Magnitude Difference Between One Star and Another Is