Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
1/(3 pi^2) * (2 m_e * 18.6 keV / hbar^2)^(3/2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random