Can Light Radiation Really Convert into Matter?

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Discussion Overview

The discussion centers on the potential for light radiation to convert into matter, exploring theoretical and experimental aspects of this phenomenon. Participants examine various processes, such as photon interactions and the implications of high-energy electromagnetic radiation, in the context of physics and cosmology.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Some participants assert that electromagnetic radiation of sufficiently high energy can transform into matter, specifically citing gamma rays producing positrons and electrons in the presence of atomic nuclei.
  • Others mention that the Big Bang theory suggests all matter originated from radiation-to-matter processes involving high-energy photons.
  • One participant raises the question of what process provides a nucleus for photons to interact with, while another notes that photon-photon collisions could also lead to matter creation.
  • Some contributors discuss the possibility of reversing the process of light into matter, questioning whether it is feasible to create electrons from photons in a classroom setting.
  • References to experimental efforts, such as those at Jefferson Lab, are made, highlighting attempts to produce particles like kaons from photon interactions.
  • Participants express interest in the implications of these processes for understanding the early universe and the nature of matter.

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement regarding the mechanisms of light converting into matter. While some acknowledge the established processes involving high-energy photons and atomic nuclei, others propose alternative scenarios and raise questions about the feasibility of creating matter from light in controlled environments. The discussion remains unresolved with multiple competing views.

Contextual Notes

Limitations include the dependence on specific conditions for photon interactions, such as the presence of nuclei or the energy levels involved. The discussion also reflects varying interpretations of experimental results and theoretical implications without reaching consensus.

  • #31
AWolf said:
Electron - Positron Annihilation

Both the electron and the positron have a mass of 9 x 10^-31 kg and their energy = 0.51 MeV
Both have spin = 1/2

When the two particles collide, the result is two massless photons each with a energy of 0.51 MeV.

The mass of both particles along with their positive or negative charge has gone. Instantly decayed to nothing. All that is left is energy.

"All that is left is energy".

I imagine that's all there was in the first place. So that, nothing is lost and nothing is gained. Is this true? Is it simply that the energy is transformed and redistributed? "Neither created nor destroyed".
 
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  • #32
p-brane said:
"All that is left is energy".

I imagine that's all there was in the first place. So that, nothing is lost and nothing is gained. Is this true? Is it simply that the energy is transformed and redistributed? "Neither created nor destroyed".
Conservation of energy states, as you put it, Neither created nor destroyed. So the only option available is to manipulate it. Transform it from one thing into another.

The electron and the positron have the same energy, but their other properties provide each particle with its own identity. After the collision, the two particles that result have different identities from the electron and positron. For one, they have no mass and no charge.

According to the conservation of energy, the energy before the collision must equal the energy after. So if we've accounted for all the energy, what happened to the mass and charge of the electron or positron ?

The configuration of the energy of the electron and that of the positron, must have canceled out the other, leaving plain energy behind, with no complex configuration.
 

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