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.
6.62*10^-34*3*10^8 /(250*10^-9) - 7.15*10^-19
6.62*10^-34*3*10^8 /(250*10^-9) - 7.15*10^-19
Natural Language
Math Input
Extended Keyboard
