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.
(2*(1.48×10−27 * 1.6749 x 10^-27)) / (299 792 458)^2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
