Physics

Energy to Wavelength Calculator

Convert photon energy to its wavelength.

Calculated Output

Wavelength (nm) 495.94

Frequency (THz) 604.5

Formula: λ = h·c ÷ E

Step-by-Step Breakdown

1. Values used:

2. Photon energy = 2.5 eV

4. Wavelength = 495.94nm

5. Frequency = 604.5THz

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The math behind it

λ = h·c ÷ E. A handy shortcut: λ(nm) ≈ 1240 ÷ E(eV).

2.5 eV → about 496 nm (blue-green).

What's the 1240 rule?

λ in nm ≈ 1240 divided by energy in eV — a quick photon conversion.