Destructive interference and energy

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Discussion Overview

The discussion revolves around the concept of destructive interference in light waves, particularly in the context of photon interactions and energy conservation. Participants explore the implications of photon annihilation and the behavior of light waves in interference patterns, including potential absorption by electrons.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions where the energy goes when a pair of photons annihilate each other and how this relates to interactions with electrons, suggesting a connection to destructive interference in sound waves.
  • Another participant clarifies that destructive interference results in areas of zero light intensity but also areas of constructive interference, emphasizing that total energy is conserved and that photons do not annihilate each other during interference.
  • A different participant asserts that photon annihilation can only occur when photons produce a pair of particles, noting that this process requires high-energy photons and is unrelated to visible light interference.
  • Another response reiterates that the energy of photons does not disappear but transforms into the mass of the produced particles, emphasizing that energy conservation remains intact.

Areas of Agreement / Disagreement

Participants express differing views on the nature of photon interactions and the implications of destructive interference. There is no consensus on the relationship between photon annihilation and interference, and the discussion remains unresolved.

Contextual Notes

Participants highlight the complexity of photon interactions and the conditions under which annihilation occurs, indicating that assumptions about energy transformation and conservation may depend on specific contexts and definitions.

24forChromium
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Where do the energy go in a pair of photons that are annihilating each other exactly? What happens when they collide with something that absorbs photons like an electron? (I think electron can absorb the e. in a photon to jump into a higher level) Would this light wave become undetectable like destructively interfering sound?

I was thinking in the context of a laser beam, suppose light waves of various frequencies are sent, the beam may be less "powerful" because of interference, or so I heard.
 
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Destructive interference creates areas of zero light intensity (the dark regions in a classical interference patterns), but there are also areas of constructive interference (the bright regions in the pattern) where the intensity is greater than it would otherwise be. The two effects balance so the total energy is conserved.

None of this has anything to do with photons, which don't annihilate each other when the interfere.
 
24forChromium said:
where do the energy go in a pair of photons that are annihilating each other exactly?
The only way for that to happen is for them to produce a pair of particles (one is the anti-particle of the other). The photon energy goes into the mass of the pair.

This is extremely unlikely and requires very high energy photons. It is not related to interference of visible light.
 
DaleSpam said:
The photon energy goes into the mass of the pair.
Said in this way could seem that "the photons energy disappear and is transformed in something else", which is false. The energy stay the same. Better to say that 2 particles transform in other 2 particles.

--
lightarrow
 

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