Consider the fundamental process of pair production in which a particle and its
ID: 1569296 • Letter: C
Question
Consider the fundamental process of pair production in which a particle and its antiparticle are created when a photon of high enough kinetic energy passes through the Coulomb field of a heavy nucleus. What exact conservation laws, if any, does this process violate?
1. Mass conservation... particles with mass are created from nothing.
2. Energy conservation... particles with energy are created out of nothing.
3. Lepton number conservation... matter is created out of nothing.
4. Baryon number conservation... matter is created out of nothing.
5. Charge conservation... particles with charge are created out of nothing.
6. It does not violate any known conservation law.
Explanation / Answer
first learn about pair production.
pair production is a process of creation of elementary particle and its antiparticle. some example of this process are like creation of electron and positron, proton and antiproton.
let us take an example that when an electron and positron collide with each other and as a result of its collision is observed when a gamma ray photon produced.
so, in this process a number of conservative law are satisfy.
1. Conservation of electric charge - the net charge before and after the collision remain zero.
2. conservation of linear momentum - the momentum before and after collision remain same.
3. conservation of total energy.
4. conservation of angular momentum.
5. Conservation of total lepton number.
(lepton number = number of electron - number of positron)
i think this process is violate the mass conservation because this is used to convert energy into mass.