Physics 5 — Modern Physics

Light comes in chunks: E = h·f

A photon's energy is its frequency times Planck's constant — an absurdly small number, which is why light looks continuous. Green light, one photon at a time:

h_{p} = 6.626 \cdot 10^{-34}

Planck constant (J·s)

f_{green} = 560000000000000

green light frequency (Hz)

E_{photon} = h_{p} \cdot f_{green}

3.7106 \times 10^{-19}

~3.7×10⁻¹⁹ J per chunk

N_{per_J} = \frac{1}{E_{photon}}

2.695 \times 10^{18}

photons in one joule — about 2.7×10¹⁸