# Direction for an electron in the 1s orbital of Hydrogen be?

1. Feb 26, 2004

### carmen electron

What would the value of linear momentum in the r direction for an electron in the 1s orbital of Hydrogen be?

Is this an expectation value or eigenvalue?

2. Feb 26, 2004

### Tom Mattson

Staff Emeritus
Re: eigenvalues

I really think you should be doing yer own homework , but I'll give a little hint. Linear momentum is p&psi;=i(hbar)grad&psi;. Use the appropriate component.

The eigenvalues ai of an operator A corresponding to states &psi;i are defined by:

A&psi;i=ai&psi;i.

The expectation value of an operator A in state &psi;i is defined by:

&int;&psi;*A&psi;d3x

Can you figure out which one you have here?