How much does the gravitational redshift change a neutron star

One of the visible lines in the hydrogen emission spectrum corresponds to the n = 6 to n = 2 electronic transition. What color light is this transition ?

Consider a large number of hydrogen atoms, with electrons all initially in the n = 4 state. (a) How many different wavelengths would be observed in the emission spectrum of these atoms? (b) What is the longest wavelength that could be observed? (c) To which series does the wavelength found in (b) belong?

A bright red star is moving towards Earth. Which of the choices best completes the following statement describing the spectrum of this star? A(n) ___________ spectrum that is _______ relative to an unmoving star.
A. continuous; blueshifted
B. continuous; redshifted
C. emission; redshifted
D.absorption; blueshifted
E. absorption; redshifted

From my quick investigation, the spectrum is based on the Rydberg formula, and with a small change, would lead to
$\frac{1}{{\lambda }_{\mu }}=\frac{m_{\mu }}{m_e}\left(R(\frac{1}{n_1^2}-\frac{1}{n_2^2})\right)$
where $m_{\mu }$ is the mass of a muon.
So, taking hydrogen as an example, we would observe similar bands, shifted into the x-ray/gamma range.
Is this correct?

What lines would be missing for hydrogen in an absorption spectrum? What wavelengths are missing for hydrogen in an emission spectrum?

I need to be able to convert an arbitrary emission spectrum in the visible spectrum range (i.e. for every wavelength between 380 and 780, I have a number between 0 and 1 that represents the "intensity" or dominance of that wavelength), and I need to be able to map any given spectrum into a particular color space (for now I need RGB or CIE-XYZ). Is it possible?
For the spectrum say I have the emission spectrum of a white light, then every wavelength in the spectrum will have an intensity of 1, whereas for a green-bluish light I'd have most of the wavelengths between 500 and 550 with an intensity close to 1, with other wavelengths gradually dropping in intensity. So the first spectrum should be converted to pure white whereas the other one would be converted to a green-bluish color in any color space.
Is there a way to do this?

When sodium is bombarded with electrons accelerated through a potential difference $\mathrm{\Delta }V$, its x-ray spectrum contains emission peaks at 1.04 keV and 1.07 keV. Find the minimum value of $\mathrm{\Delta }V$ required to produce both of these peaks.