Calculate frequency, wavelength, and photon energy for visible and invisible light.
Light Properties
Light Analysis
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About this calculator
Quick Reference
cSpeed of light (3×10⁸ m/s)
λWavelength (nm)
fFrequency (Hz)
hPlanck's constant (6.63×10⁻³⁴ J⋅s)
EPhoton energy (eV)
Visible light380-750 nm
Ultraviolet< 380 nm
Infrared> 750 nm
Overview
Calculate the frequency and photon energy of light from its wavelength. Light frequency determines its color in the visible spectrum and its energy for applications in physics, chemistry, and technology.
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Pro Tips
Visible light ranges from ~380 nm (violet) to ~750 nm (red)
Frequency = speed of light / wavelength
Photon energy E = h × f (Planck's equation)
Higher frequency = higher energy = shorter wavelength
Ultraviolet light has higher energy than visible light
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Fun Facts
"A single photon of green light has energy of about 2.3 electron volts"
"The human eye can detect light frequencies from 430-750 THz"
"Infrared light (heat) has lower energy than visible light"
"Ultraviolet light can damage DNA and cause sunburn"
"X-rays have millions of times more energy than visible light photons"
