Two Red Stars Have Surface Temperatures of 3000 K, but Star

question 4

Multiple Choice

Two red stars have surface temperatures of 3000 K, but Star A's luminosity is about 5% ofthe Sun's and Star B's luminosity is about 32,000 times the luminosity of the Sun. How muchbigger is star B than star A?

• A)They are the same size.
• B)Star B's radius is about 16 times larger than star A's radius.
• C)Star B's radius is about 800 times larger than star A's radius.
• D)Star B's radius is about 640,000 times larger than star A's radius.
• E)This cannot be determined from the information given.

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