Mass-Energy: Particle Behavior & Properties

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Discussion Overview

The discussion revolves around the mass-energy of various particles, including photons, electrons, and quarks, and how these quantities relate to the behavior and interactions of these particles. Participants explore theoretical implications, experimental observations, and the application of mass-energy in predicting particle behavior in different contexts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant states specific mass-energy values for a photon, electron, and quarks, questioning what these quantities enable the particles to do.
  • Another participant suggests that the mass energy of particles can be used to determine if certain reactions are kinematically allowed and to compute trajectories in electromagnetic fields.
  • A subsequent post seeks clarification on whether mass-energy can predict motion and questions the mass-energy characteristics of photons in relation to their interactions with other particles.
  • One participant draws an analogy with the mass of animals to illustrate the difficulty in inferring behavior from mass alone, suggesting that a more specific question is needed.
  • Another participant asserts that mass-energy allows particles to perform work, similar to other forms of energy.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the implications of mass-energy for particle behavior. There is no consensus on the specific applications or interpretations of these quantities, and multiple perspectives on the role of mass-energy in particle interactions are presented.

Contextual Notes

Some assumptions about the nature of mass and energy, as well as the specific conditions under which particles interact, remain unresolved. The discussion does not clarify the definitions of mass and mass-energy in the context of different particles.

gamow99
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The mass energy of a photon is 1*10^-18 eV/c^2
The mass energy of an electron is .5 MeV/c^2
The mass energy of an up quark is 2.3 MeV/c^2
The mass energy of a down quark is 4.8 MeV/c^2

I don't understand what these quantities enable to the particle to do. If we know these quantities then what can we infer about the particles behavior?
 
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gamow99 said:
The mass energy of a photon is 1*10^-18 eV/c^2

This looks like an experimental upper bound. Photons are assumed to have zero mass.

Particle masses can be used in several fashions, for example to see if a decay or a particle reaction is kinematically allowed or to compute the trajectory of a particle in an electromagnetic field.
 
Orodruin said:
Particle masses can be used ... to compute the trajectory of a particle in an electromagnetic field.

Could you go into more details? Are you saying that mass-energy can be used to predict motion? If a down quark nears an up quark what quantities predict its movement? Does a photon have zero mass or zero mass-energy? I'm pretty sure that the photon only interacts with an electron. If so what happens when a photon near an neutrino or a quark?
 
I think you need to ask a more specific question. Suppose I asked this:

The mass of a fly is about .01 g
The mass of a herring is about 500 g
The mass of a giraffe is about 1500 kg
The mass of a sperm whale is about 13000 kg

I don't understand what these quantities enable to the animal to do. If we know these quantities then what can we infer about the animals' behavior?

You probably wouldn't know where to begin, right? Same problem here.
 
gamow99 said:
I don't understand what these quantities enable to the particle to do.
It let's them do the same thing as any other form of energy: work.
 

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