Thursday
May 23, 2013

# Homework Help: physics help!

Posted by jason on Sunday, April 22, 2012 at 5:32pm.

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

• physics help! - Elena, Sunday, April 22, 2012 at 5:58pm

Moseley's law
1/λ = R (Z σ)^2(1/n^2 -1/m^2),
where
R=1.110^7 m^-1 is the Rydberg constant,
Z = 50,
σ = 1 for K-series,
for K-β: n = 1, m = 3.
So
1/λ = 1.110^7  (50 1)^2(1 - 1/9) =
λ = 4.2610^-11 m

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