Photon Momentum Calculator
Enter a photon wavelength or frequency to instantly get its momentum, energy in joules, and energy in electron-volts.
Input
Visible light: 380–750 nm
Visible light: ~400–790 THz
Results
Enter a value above and click Calculate.
Photon Momentum
kg·m/s
Photon Energy (Joules)
joules (J)
Photon Energy (eV)
electron-volts (eV)
Common Photon Reference Values
| Color / Type | Wavelength | Momentum (kg·m/s) | Energy (eV) |
|---|
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Summary
Enter a photon wavelength or frequency to instantly get its momentum, energy in joules, and energy in electron-volts.
How it works
- Choose whether to input wavelength or frequency.
- Enter the value and select the appropriate unit.
- The calculator applies p = h/λ (or p = hf/c) using Planck's constant h = 6.62607015 × 10⁻³⁴ J·s.
- Photon energy E = hf = hc/λ is computed simultaneously.
- Energy is converted to electron-volts using 1 eV = 1.602176634 × 10⁻¹⁹ J.
Use cases
- Verify photon momentum for quantum mechanics homework.
- Calculate radiation pressure for optical physics problems.
- Convert between wavelength, frequency, momentum, and energy for spectroscopy.
- Explore the visible spectrum and UV/IR photon properties.
- Validate de Broglie wavelength derivations.
- Check photon energy for photoelectric effect calculations.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu