Astronomers measure stellar distances in three different units. ...

[SO00]

Astronomers measure stellar distances in three different units. The smallest of these is
 a. the light-year.
  b. the absolute magnitude.
  c. the astronomical unit.
  d. the parsec.

Question 2

For a specific element, photons of how many different energies could be emitted by electrons in the n = 6 level as they return to the n = 1 level?
 a. 15
  b. 21
  c. 6
  d. 1

[Sophiapenny]

Answer to Question 1

c

Answer to Question 2

a

[SO00]

Thanks for the timely response, appreciate it

[tandmlomax84]

YES! Correct, THANKS for helping me on my review