Physics

Problem

An observer on Earth measures the apparent brightness of two luminous stars. • Star A: radius

1.5R_{\odot}

, surface temperature

7000\,\text{K}

, distance

10\,\text{pc}

. • Star B: radius

3.0R_{\odot}

, surface temperature

5000\,\text{K}

, distance

40\,\text{pc}

. Which statement correctly describes which star appears brighter to the observer and by approximately what factor? a) Star A appears brighter, by roughly

15

times. b) Star A appears brighter, by roughly

4

times. c) Star A appears brighter, by roughly

8

times. d) Star B appears brighter, by roughly

17

times.

Browse the problem library