Enter the photon wavelength into the calculator to determine the Photon Momentum. 

Photon Momentum Formula

The following equation is used to calculate the Photon Momentum.

p = h/λ
  • Where p is the Photon Momentum (ms*kg)
  • h is the Planck’s constant (6.62607004 × 10-34 m2 kg / s)
  • λ is the wavelength (m)

To calculate photon momentum, divide Planck’s constant by the wavelength.

What are the units for Photon Momentum?

The most common units for Photon Momentum are m/s*kg.

How to Calculate Photon Momentum?

Example Problem:

The following example problem outlines the steps and information needed to calculate the Photon Momentum.

First, determine the photon wavelength. In this example, the photon wavelength is determined to be 234 (m).

Finally, calculate the Photon Momentum using the formula above: 

p = h/λ

Inserting the values from above and solving the equation with the imputed values gives: 

p = (6.62607004 × 10^-34 )/234= 2.83e-36 (m/s*kg)