Question

How can you calculate ionization energy from wavelength?

Answer 1

I would say by using Einstein's Formula: `E=hf`

Explanation:

If you have the wavelength `lambda` of the photon needed to take an electron away from the atom you can use it into:
`E=hf`
where `h` is Planck's Constant and `f` the frequency.
Knowing that for the speed of light you have `c=lambdaf`
and so:
`E=hc/lambda`