What is the frequency of visible green light (~530nm)?

You can work it out this way: use c = fλ.

Which has more energy: UV or infrared?

You can work it out this way: compare their frequencies.

Calculate the photon energy of a 100nm UV photon in eV.

E = hc/λ, then convert J to eV.

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Pro 🔒~12 min

Electromagnetic Spectrum

From radio waves to gamma rays

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How it works

The electromagnetic spectrum encompasses all types of electromagnetic radiation, from radio waves with the longest wavelengths to gamma rays with the shortest. All EM waves travel at the speed of light (c = 3×10⁸ m/s). Higher frequency means higher photon energy.

Step-by-step

Drag the wavelength slider to move across the EM spectrum.
Watch the wave visualization change and observe how frequency and energy respond.
The band name updates automatically.

Key formulas

$c = f \lambda$ Wave equation
$E = hf$ Photon energy
$E = \frac{hc}{\lambda}$ Energy from wavelength

Frequently asked questions

What is the frequency of visible green light (~530nm)?: You can work it out this way: use c = fλ.
Which has more energy: UV or infrared?: You can work it out this way: compare their frequencies.
Calculate the photon energy of a 100nm UV photon in eV.: E = hc/λ, then convert J to eV.