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`E = \frac{h c}{\lambda}`

Enter a value for all fields

The **Photon Energy from Wavelength** calculator compute the energy of a photon based on Planck's constant (h), the speed of light (c) and the wavelength of the photon ( λ).

**INSTRUCTIONS**: Choose units and enter the following:

- (
**λ**) This is the wavelength of the photon

**Energy of Photon (E):** The calculator returns the energy in Joules. However, this can be automatically converted to compatible units via the pull-down menu.

The energy of a photon depends only on its wavelength. The formula for the energy of a photon is:

where:

- E = energy of the photon
- h = Planck's constant
- c = speed of light ( 2.998 × 10
^{8}m/s) - λ= wavelength of the light

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