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Why conversion of a photon to an electron positron pair is not possible in free space?
Wiki User
∙ 14y ago
Because energy mass conservation will not be satisfied in free space, so that this process needs some material by which this conversion will be proceed.
Wiki User
∙ 14y ago
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When photon disappear in producing an electron and a positron is the energy of photon equivalent to that of the particles produced?
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Can a virtual photon create muon antimuon and tau antitau pair instead of electron positron pair?
Yes, although the heavier pairs are less likely to be found, it is not impossible.
Which subatomic particle is most easily lost from an atom?
The photon probably may be the answer. Every time an electron of an atom gets "excited" after gaining energy, it emits a photon to reach, or rather obtain the ground state(energy levels)
What does the MeV in MeV photon mean?
The MeV means million electron volts. It's a measure of the energy the energy in the photon, which is a quantum (or specific quantity) of electromagnetic energy. This 1 megaelectron volt = 1.60217646 × 10-13 joules of energy.
What is the adjective of atom?
Since you can't describe something else as "like an electron" there isn't one however if you wanted to say a photon was electron-ic you would say it is subatomic or something else they have in common.
When photon disappear in producing an electron and a positron is the energy of photon equivalent to that of the particles produced?
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Describe what happens when a positron and an electron collide?
They destroy each other and create a gamma photon.
An excited atom can lose energy by?
*Capturing an orbiting electron *Emitting a positron So C both of the above
The collision of one electron and one positron produces one or two photons?
This supposition is not true. Mutual annihilation, which occurs when a positron combines with an electron, will result in the conversion of all of the mass of both particles into energy. And this will result in the formation of two photons. The production of the photon pair is the result of conservation laws, and the two photons leave the event in opposite directions. Use the related link below to learn more.
What is the minimum energy to produce ionization?
The minium required energy of a photon that is involved in the creation of an electron-positron pair (which is pair production), is 1.022 MeV.An electron-positron pair has a given probability of being produced when a photon of the stated energy (or a higher energy) passes close the nucleus of an atom. Pair production does not happen "in the presence of a photon" but happens as a direct result of the the actual presence of a photon (having at least the stated energy) in the presence of an atomic nucleus. The presence of an atomic nucleus is necessary to insure conservation of the quantum mechanical characteristics of the event. Said another way, the high energy photon alone cannot spontaneously create the electron-positron pair in pair production. A link can be found below to related questions.
Why you need 1.022 Mev in pair?
Pair production can only occur if the energy of the photon is bigger than the rest mass (E0 = m0*c^2) of electron and positron, because this is the energy needed to create these particle (conservation of energy). Excess energy will be kinetic energy of the electron and positron. Rest mass of electron and positron is 0.511 MeV each, so 1.022 MeV in total.
What happens when a positron and a electron collide?
They annihilate each other to produce energy, in the form of gamma rays.
Is a beta particle a helium nucleus or an electron?
A beta particle is a high energy electron. An alpha particle is a helium nucleus. A gamma ray is a high energy photon.
What happens to an atom that experiences radioactive decay?
It loses mass.
If an electron and photon both have energy of 5 mega electron volt which will cause pair production?
pair production only occurs with photons. The necessary condition is that the energy of the photon is greater than that of the two particles that are going to be produced. With 5 mega electron volts as an energy your photon would still not have enough juice as the two smallest particles that can be build are electron and its anti patricle the positron. Both have 511 MeV. You are looking at a trickquestion as neither can.
Can a virtual photon create muon antimuon and tau antitau pair instead of electron positron pair?
Yes, although the heavier pairs are less likely to be found, it is not impossible.
Where does the particle photon come from?
A photon may be both a particle and a wave (light). Photons are normally emitted when an electron loses energy either by bending its path or by falling from a higher orbital state to a lower orbital state. Very high energy photons called gamma ray can also be formed from a positron and and electron merging.
