# Question #aacb3

##### 1 Answer

Mar 25, 2017

The energy of the photon is

#### Explanation:

You use the **Rydberg formula** to calculate the energy.

Rydberg's original formula did not look directly at energies, but we can rewrite the formula to have these units.

The Rydberg formula in terms of energy is

#color(blue)(bar(ul(|color(white)(a/a) E = R(1/n_text(f)^2 - 1/n_text(i)^2)color(white)(a/a)|)))" "#

where

In this problem,

∴