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Qalc AI
Wavelength To Energy
Calculate photon energy from wavelength.
Input
Wavelength (meters)
Tip: 500nm = 5e-7 meters.
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Photon Energy
Energy (Joules)
-
J
Energy (eV)
-
eV
Quick Reference
h
Planck Constant
c
Light Speed
1 eV
1.6e-19 J
Overview
Calculate the energy of a single photon using the Planck-Einstein relation: E = hc / λ.
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Pro Tips
h = 6.626 × 10⁻³⁴ J·s (Planck's constant).
c ≈ 3 × 10⁸ m/s (Light speed).
Energy increases as wavelength decreases (blue light has more energy than red).
!
Fun Facts
"Ultraviolet light has enough energy to damage DNA."
"Radio waves have very low energy photons."
Formula: E = hc / λ
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