Astronomers can measure a star's mass in only certain cases. ...

[gonzo233]

Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
 
  A) We know the star's luminosity and distance. B) The star is of spectral type G.
  C) The star is a member of a binary star system. D) The star is of spectral type A.

Question 2

Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of
 
  A) 3. B) 6. C) 9. D) 12. E) 81.

[jlaineee]

Answer to Question 1

C

Answer to Question 2

E

[gonzo233]

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[jlaineee]

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