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## Homework Statement

The wavelengths λ of spectral lines produced by the Hydrogen atom are given by the expression:

Calculate the Energy in eV required to ionise the atom

## Homework Equations

p=h/[tex]\lambda[/tex]

## The Attempt at a Solution

n

_{2}= 1 and n

_{1}= infinity, therefore [tex]\lambda[/tex]=1/R.

E = p

^{2}/2m = h

^{2}/([tex]\lambda[/tex]^2*2M

_{e})

Subbing in [tex]\lambda[/tex]=1/R. and rearranging gives:

E = (h

^{2}R

^{2})/(2M

_{e})

Why doesn't this give me the right answer?

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