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## Homework Statement

He+ ion consists of a nucleus which is an alpha particle plus one orbiting electron.Hence it has a net positive charge.

a)Derive an expression for the electron state energies

b)what is the wavelength associated with a transition between the lowest two energy states?

## Homework Equations

## The Attempt at a Solution

For part a) i figured it out to be E=(-4R)/(n^2) where R is the rydbergs constant

for part b) im having trouble not sure where to begin