K Alpha Energy Question

[StudentofPhysics]

1. The atomic number of osmium is Z = 76. According to the Bohr model, what is the energy (in joules) of a K X-ray photon?



2. ?



3. The reason I left relavent eqns blank is because I used the following:
En = -(13.6) Z^2/n^2
subtracting one from Z before squaring and converting to joules gave me an incorrect answer of En = 1.226 x 10^-14 J.

I do not believe I am using the right equation but it is the only one my book offers for this.

Please help.

Thanks.

[StudentofPhysics]

ok I found it by going through the wavelength.

Is that the fastest way?

[dextercioby]

The "wave number" formula is a consequence of the formula giving the enrgy levels. So i'd say "no".