Electromagnetic wave simulation

An animated electromagnetic wave with its electric and magnetic fields at right angles. Change the wavelength to see the colour, frequency and photon energy change.

Learn electromagnetic spectrum properly

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Questions students ask

How do you find the frequency of light from its wavelength?

f = c/λ, with c = 3.00 × 10⁸ m/s. Green light of 550 nm has a frequency of about 5.45 × 10¹⁴ Hz.

What is the energy of a photon?

E = hf, where h is Planck's constant, 6.63 × 10⁻³⁴ J s. Shorter wavelengths carry more energy per photon.

Free notes on electromagnetic spectrum

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