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Physics, Astronomy & Cosmology / How can the frequency of a photon be modified?
« on: 23/05/2014 04:37:47 »
I am scratching my head to think of a way that the frequency of a photon can be changed. For example how can I changed UV light into Infra Red light and vice versa. I am not talking about the situation where a photon is emitted from a particle, just a photon on its own.