De Broglie Wavelength Calculator
Enter a particle mass in kilograms and speed in meters per second to calculate its matter wavelength.
Wavelength:
A QUICK WALKTHROUGH
How to use this tool
- Enter mass and speed in SI units.
- Calculate the wavelength.
- Review the result in meters and nanometers.
Model and limits
This uses the nonrelativistic relation λ=h/(mv). It is not appropriate when speed is comparable to the speed of light; use a relativistic momentum model in that regime. Inputs are calculated locally and not uploaded or saved.
GOOD TO KNOW
Common questions
What units should I enter?
Mass in kg and speed in m/s.
Is this relativistic?
No. The stated equation assumes nonrelativistic speed.