# What is the difference in amplitude between red and blue photons?

What is the difference in amplitude between red and blue photons? Which has a great amplitude? Where is the definition of a photon's amplitude defined?

Hello mcgucken,

a photon does not have an amplitude, an amplitude for a photon is not defined (unless you mean the probability amplitude). The red and blue photon differ by their wavelength. For example a red photon $\lambda = 800$nm and blue photon $\lambda = 400$nm.

When you talk about amplitudes you usually refer to electromagnetic waves amplitudes. But one single photon does not have an amplitude.

Meir Achuz