Consider the process of pair production, in which a particle and antiparticle ar

Question

Consider the process of pair production, in which a particle and antiparticle are created when a photon of high enough kinetic energy passes through the coulomb field of a heavy nucleus. what conservation law, if any, does such a pair production violate?

1. lepton number convervation... matter is created out of nothing

2. charge conservation... charge is created out of nothing

3. Energy conservation... particles are created out of nothing

4. it does not violate any known conservation law

5. Baryon number conservation... matter is created out of nothing

6. Mass conservation... mass is created out of nothing

Explanation / Answer

Answer is

6. Mass conservation... mass is created out of nothing

While all others need to be conserved for a pair production process...

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