Balmer lines in the spectra of stars..help?

Question

Why don't we see hydrogen Balmer lines in the spectra with temp of 45,000K
a. There is no hydrogen in stars this hit
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 electrons in the hydrogen atom are in the ground state.
d. Stars of this temp are too cool to produce an absorbtion spectrum
e. Stars of this temp are too hot to produce an absorbtion spectrum

Answer 1

b

If the surface temperature is so hot, then the electrons have absorbed sufficient energy to leave the hydrogen atoms.

The Balmer lines are emitted when an electron "pumped up" to a higher level (by absorbing energy) falls back to level 2. But in hydrogen at 45,000 K, there are no electrons left in orbit to fall back to level 2. If they did (it must happen occasionally), it cannot stay there as there is too much energy available from the heat: the electron is immediately "pumped up" and away from the atom (it immeidately re-absorbs whatever energy it was to have emitted).

Answer 2

This one interior of reason obvious once you look on the question and the available solutions. a action picture star won't have the ability to have a spectrum matching an element that may not there. purely a states that there is a loss of Hydrogen interior the action picture star. not one of the different solutions is even remotely authentic.