Question

Question #73d22

Answer 1

500 nm

Explanation:

Wave number is simply the reciprocal of wavelength.

`barnu = 1/lambda`

So to obtain wavelength from wavenumber simply rearrange to:

`lambda = 1/barnu`

1 / (2 x `10^6`) = 5 x `10^-7` m which is 500 x `10^-9` m or 500 nm.