Astrophysics Assignment

1) An important atomic transition in sodium is the electron jumping up or down between the 3p and 3s states. The energy gap between the states is roughly 2eV.

a) What is the corresponding wavelength of the photon emitted if an electron jumps down from 3p to 3s? What part of the spectrum does this correspond to?
b) A star’s sodium absorption line is measured to have a thermal broadening of No Image. What is the surface temperature of the star?