Star A has a temperature 3 times that of star B. Both star A and star B are the same physicalsize. Which statement about star A and star B below is correct?
A)Star A is redder and dimmer than star B.
B)Star A is bluer and dimmer than star B.
C)Star A is redder and brighter than star B.
D)Star A is bluer and brighter than star B.
E)Star A and star B have the same color, but star A is brighter.

Question

Quizplus · Accepted Answer

Star A has a higher temperature than star B, which means it emits more blue light (higher frequency) and less red light (lower frequency). Therefore, star A is bluer than star B. Star A is also brighter than star B because its higher temperature makes it more luminous. Star A has a higher temperature than star B, which means it emits more blue light than red light. This makes it bluer than star B. However, since both stars are of the same physical size, star A must also be brighter than star B. Therefore, the correct answer is D) Star A is bluer and brighter than star B.

Star a Has a Temperature 3 Times That of Star