- #1

can't.do.phys

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Use the saha equation to determine the fraction of hydrogen atoms that are ionised at the centre of the sun (N_II/N_tot)

T=15.7x10^6K

number density n=6.1x10^31 m^-3

m = mass of electron

the saha equation is

N_(i+1)/Ni = 2*Z_(i+1)/n*Z_i * (2π*m*kT/h^2)^(3/2) * exp(-χ_i/kT)

i get that Z_I=2 and Z_II=1 because we are assuming most of the hydrogen is in the ground state(or is that what I am doing wrong)? I've also tried changing units from J to eV but that doesn't seem to be doing anything.

i think at the end of this I am meant to get a fraction or percentage, but i keep getting stupid numbers like to the power of -34. can someone tell me what I am doing wrong?