The short answer is that there is NO upper limit to the energy of a single photon.
A photon CAN have any energy at all, so the question is whether there are any physical processes (things going on) in the universe that can make a photon with some really large energy. The highest-energy photons are generated in (i) extreme astrophysical conditions (such as by matter spiralling around a black hole) and (ii) particle collider experiments (such as those at the world’s most powerful accelerator, the LHC at CERN: http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/).
Hi leelee1997,
The short answer is that there is NO upper limit to the energy of a single photon.
A photon CAN have any energy at all, so the question is whether there are any physical processes (things going on) in the universe that can make a photon with some really large energy. The highest-energy photons are generated in (i) extreme astrophysical conditions (such as by matter spiralling around a black hole) and (ii) particle collider experiments (such as those at the world’s most powerful accelerator, the LHC at CERN: http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/).
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Hi leelee1997,
what Edward says! He’s the physics expert!
😉
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