Author Question: Astronomers measure stellar distances in three different units. The smallest of these is a. the ... (Read 118 times)

SO00 · **on:** Jul 28, 2018

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