Per unit area (such as a square centimeter), a B star whose ...

[ahriuashd]

Per unit area (such as a square centimeter), a B star whose surface temperature is 10,000 K will put out how much radiation compared to an O star whose surface temperature is 30,000 K?
 
  A) 81 times as much
  B) 9 times as much
  C) 1/81 as much
  D) 1/9 as much
  E) 1/3 as much

Question 2

Cluster ages can be determined from
 
  A) main sequence fitting.
  B) main sequence turnoff.
  C) pulsating variable stars.
  D) spectroscopic binaries.
  E) visual binaries.

[TINA]

Answer to Question 1

C

Answer to Question 2

B

[ahriuashd]

Gracias!

[pangili4]

TYSM