Question

What must occur when an electron in an atom returns from a higher energy state to a lower energy state?

Answer 1

What must occur when an electron in an atom returns from a higher energy state to a lower energy state?

**Answer:**

When an electron in an atom returns from higher energy state to a lower energy state, the total energy of atom decreases and occur **emission of a photon**. The frequency radiation is:

$$\nu = \frac {E _ {2} - E _ {1}}{h},$$

where $E_2$ – energy of higher level; $E_2$ – energy of lower level; h – Plank’s constant.