Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?
a. There is no hydrogen in stars this cool.
b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy.
c. These stars are so cool that nearly all of the hydrogen atoms are in the ground state.
d. Stars of this temperature are too cool to produce an absorption spectrum.
e. Stars of this temperature are too hot to produce an absorption spectrum.