If the magnitude difference between one star and another is 8, ...

[humphriesbr@me.com]

If the magnitude difference between one star and another is 8, the stars differ in brightness by a factor of
 a. 2.51.
  b. 20.
  c. 7.
  d. 1580.

Question 2

When many of the atoms or molecules in a sample have been excited into a metastable state, a(n) ______________ has occurred.
 a. ultraviolet catastrophe
  b. population inversion
  c. coherent emission
  d. incoherent absorption

[enass]

Answer to Question 1

d

Answer to Question 2

b

[humphriesbr@me.com]

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