When an electron is treated as a matter wave it may be interpoeted as arting an a standing wave dellouglie wavelength is given by

$2r=n$

Where:

$2$ncis the circumtermice of the oabir $($mi$)$

It is the quatum number an energy level $($always a wibul inamber$)$

A is the do Brogae wavelength $($m$)$ from the nuclems uben the elechon is un its first eng