Particle & Wave Nature of EM Energy: Questions Answered

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Discussion Overview

The discussion revolves around the particle and wave nature of electromagnetic (EM) energy, addressing fundamental questions about the definitions of waves and particles, their relationship, and the propagation of light without a medium. Participants explore theoretical concepts and seek clarification on quantum physics principles.

Discussion Character

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

Main Points Raised

  • One participant questions the definitions of waves and particles and their relationship, suggesting that light can travel without a medium.
  • Another participant asserts that waves do not require a medium to travel and connects this to Einstein's relativity equation E=mc², proposing that every particle is also a wave.
  • A participant expresses confusion about whether every particle acts as a wave or if it is guided by a wave, indicating a lack of clarity on the wave-particle duality.
  • Further exploration is requested regarding how light propagates without a medium, with one participant suggesting that the medium might be undetectable and that Einstein's framework does not require it.
  • Participants discuss the concept of waves as frequency distributions and particles as the entities being distributed, using the example of quantum experiments to illustrate the relationship between light and its observed patterns.

Areas of Agreement / Disagreement

Participants express a range of views on the nature of waves and particles, with no consensus reached on the necessity of a medium for light propagation or the precise relationship between particles and waves.

Contextual Notes

Participants acknowledge the complexity of the topic, with some expressing uncertainty about foundational concepts in quantum physics and the implications of wave-particle duality. There are references to hypothetical mediums and the limitations of current understanding regarding light propagation.

Karthikeyan
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Hi friends,
I have some question regarding particle and wave nature of EM energy.

1. What is a wave and a particle? How are they related?
2. Also, we know that sun light travels through the universe down to earth..so light can travel without any medium...But waves do require medium to travel..so how is it? Does the EM energy takes particle form to traverse medium less area and wave form in a medium?
 
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A wave does not have matter but a particle does.
And who said wave needs a medium to travel ! well they are related by einstins relativity equation.E=mc square. and can be explained by the wave particle duality of quantum physics.
every particle is wave and wave is particle. it may seem strange but has meen proved.
 
Thanks for the replies...I asked this question becoz I had few basic doubts now that with these replies let me formulate them too
1. Fine that light can travel without a medium but how does it happen...In a medium I can say that the energy propagates itself through the medium but how is it where there is no medium
2. Fine again that E=mc^2 relates particle to wave, but I would appreciate a more practical explanation since that would help me understand few basics in quantum physics..I mean wave is energy packets right then what is particle...is it a single energy packet or something like that
 
confused!

priya_india said:
A wave does not have matter but a particle does.
And who said wave needs a medium to travel ! well they are related by einstins relativity equation.E=mc square. and can be explained by the wave particle duality of quantum physics.
every particle is wave and wave is particle. it may seem strange but has meen proved.

Does every particle is a wave or every particle acts as if guided by a wave between the position measurements? I am really confused about that.
Thanks
 
Karthikeyan said:
Thanks for the replies...I asked this question becoz I had few basic doubts now that with these replies let me formulate them too
1. Fine that light can travel without a medium but how does it happen...In a medium I can say that the energy propagates itself through the medium but how is it where there is no medium
It's not that anybody knows that light waves aren't disturbances in some medium. It's just that the medium is, so far, undetectable. So what would you say about this hypothetical medium? Anyway, Einstein developed a nice kinematics that doesn't require referencing the light medium -- and physicists can carry on with their work as if such a medium doesn't exist. But really, nobody knows.

Karthikeyan said:
2. Fine again that E=mc^2 relates particle to wave, but I would appreciate a more practical explanation since that would help me understand few basics in quantum physics..I mean wave is energy packets right then what is particle...is it a single energy packet or something like that
A wave is a frequency distribution. A particle is what's being distributed.

For example, in quantum experiments involving very weak light going through, say, a double-slit apparatus and producing a predictable pattern (after thousands of 'dots' had been produced) of individually appearing 'dots' (that is, the patterns are generated dot-by-dot) on a detecting screen. You can think of the individual 'dots' as the particles (or photons) in this sort of situation and their distribution on the screen as the wave (or, in the case of a double-slit setup, what's produced via the interaction or interference of two waves).

What are the precise physical characteristics of the 'optical disturbance(s)' (the light) that traveled between the emitter and the detecting screen to produce the observed pattern? Nobody knows. But qm treats the situation between emission and detection as if it were a wave.
 

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