De Broglie Wavelength Calculator
Calculate the de Broglie wavelength of a particle from its mass and velocity or kinetic energy.
Input Parameters
Result
Enter values and click Calculate
De Broglie Wavelength
| Parameter | Value |
|---|
Formula applied
Common Particle Masses
| Particle | Mass (kg) | Symbol |
|---|---|---|
| Electron | 9.109 × 10⁻³¹ | e⁻ |
| Proton | 1.673 × 10⁻²⁷ | p⁺ |
| Neutron | 1.675 × 10⁻²⁷ | n |
Planck's constant h = 6.626 × 10⁻³⁴ J·s
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Summary
Calculate the de Broglie wavelength of a particle from its mass and velocity or kinetic energy.
How it works
- Select a calculation mode: velocity + mass or kinetic energy + mass.
- Choose a preset particle (electron, proton, neutron) or enter a custom mass in kilograms.
- Enter the velocity in meters per second or kinetic energy in electron-volts.
- The calculator applies lambda = h/p, where p = mv for velocity mode and p = sqrt(2mKE) for energy mode.
- Results appear instantly in both picometers (pm) and nanometers (nm).
Use cases
- Verify homework or exam solutions for quantum mechanics courses.
- Compare the wavelength of electrons versus heavier particles at the same speed.
- Explore how kinetic energy affects the wave nature of sub-atomic particles.
- Understand why macroscopic objects have negligibly small de Broglie wavelengths.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu