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mark!
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Pair production only occurs with high energetic photons (gamma rays rather than infrared rays, because a photon needs to have a higher energy than the sum of the rest mass energies of the electron and the positron).
Where (on Earth and/or in space) does this occur? And why don't ALL gamma rays produce e+ and e- particles, but some gamma rays evidently do? Are there environmental requirements?
Where (on Earth and/or in space) does this occur? And why don't ALL gamma rays produce e+ and e- particles, but some gamma rays evidently do? Are there environmental requirements?