Two stars have the same radius but have very different temperatures. The red sta
ID: 2140839 • Letter: T
Question
Two stars have the same radius but have very different temperatures. The red star has a surface temperature of 3000 K and the blue star has a surface temperature of 15,000 K. By what factor is the blue star more (or less) luminous compared to the red star? (for example, 2 times, 10 times, 100 times?)
(a) The blue star is _____ times (b) _____ (more/less) luminous.
Two stars have the same radius but have very different temperatures. The red star has a surface temperature of 3000 K and the blue star has a surface temperature of 15,000 K. By what factor is the blue star more (or less) luminous compared to the red star? (for example, 2 times, 10 times, 100 times?) (a) The blue star is _____ times (b) _____ (more/less) luminous.Explanation / Answer
P goes like T^4 so
(15000/3000)^4 = 5^4 = 625 more luminous
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