# Do all the photons have the same energy? [duplicate]

The title is pretty self-explanatory. Do all the photons have the same energy?

• ASCII I Imagine that you are young and that is why a gave you an up. Feb 24 '17 at 16:51
• No. Photons with smaller wavelength have higher energy. The relation between them is given by the Planck constant. You can read more from that in this question. Feb 24 '17 at 17:09
• Possible duplicate of Can someone explain Planck's constant simply? Feb 24 '17 at 17:10
• I'm voting to close this question because a simple google search would have given the answer. Feb 24 '17 at 17:38
• -1. No research effort. Feb 25 '17 at 3:24

No, the energy of a photon is connected to its frequency $\nu$ via $$E = h\nu$$ where $h$ is the Planck constant. So a blue photon is more energetic than a red one, for example.

• But how does a single photon have a frequency. Feb 24 '17 at 15:17
• @ASCII This was answered here: physics.stackexchange.com/questions/29010/… Feb 24 '17 at 15:19
• @ASCII short answer: each photon is a wave. All waves have a frequency
– Jim
Feb 24 '17 at 15:20
• That's the problem with photon , you can't visualize it in an easy way, I think of it as a small localized chunk of wave, so when you say frequency of photon that just means the frequency of that wave chunk, which is same as the frequency of light. Feb 24 '17 at 15:48
• Feb 25 '17 at 10:28