What is the nature of light and how does it affect our world?

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Discussion Overview

The discussion revolves around the nature of light, exploring its physical properties, behavior, and interactions with matter. Participants raise questions about whether light is a physical entity, its speed, weight, and what happens when it interacts with objects, as well as the implications of light's dual nature.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants question whether light can be considered a physical item, comparing it to a brick at an atomic level.
  • There is curiosity about the speed of light and why it does not exert weight on objects, with some suggesting that light may be weightless.
  • Participants discuss the interaction of light with materials, questioning whether light ceases to exist after being absorbed by an object.
  • One participant notes that light has no mass but possesses energy, momentum, and a gravitational field.
  • Another participant explains that photons have momentum, which can exert pressure if produced in large quantities.
  • There is a discussion about the fate of atoms that interact with light, with various outcomes proposed, such as electron emission or energy level changes.
  • Some participants mention the dual nature of light and its properties, suggesting that understanding wavelength is key to grasping its behavior.

Areas of Agreement / Disagreement

Participants express a range of views on the nature of light, with no consensus reached on several fundamental questions regarding its properties and interactions.

Contextual Notes

Some statements rely on definitions that may not be universally agreed upon, and there are unresolved questions about the implications of light's behavior and its interactions with matter.

gordonisnz
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Hi,

I've just been thinking (saw another thread about light).

Is light a physical item (Ie a brick..- Though on a atomic level)..

what causes light to go "fast", & as it hits us, why aren't we crushed with all the weight ?
(or is light weightless ?? )

as light doesn't pass through things (IE a thick piece of paper), does light just stop traveling & cease to exist (after lighting up the object being hit)...

what happens to the atoms making up the light after the light stops / ends. ?

I guess some scientific paper has already been written about the above questions...
 
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gordonisnz said:
Hi,

I've just been thinking (saw another thread about light).

Is light a physical item (Ie a brick..- Though on a atomic level)..

what causes light to go "fast", & as it hits us, why aren't we crushed with all the weight ?
(or is light weightless ?? )

as light doesn't pass through things (IE a thick piece of paper), does light just stop traveling & cease to exist (after lighting up the object being hit)...

what happens to the atoms making up the light after the light stops / ends. ?

I guess some scientific paper has already been written about the above questions...
To begin with, study Electromagnetism.
 
light has no mass , but it has energy and momentum and a gravitational field .
 
gordonisnz said:
Is light a physical item (Ie a brick..- Though on a atomic level)..
The term "physical" isn't really well-defined, or useful.

gordonisnz said:
what causes light to go "fast", & as it hits us, why aren't we crushed with all the weight ?
(or is light weightless ?? )
Photons have momentum, and it's transferred to you when it hits you. If you could produce truly absurd amounts of light, it would cause a significant pressure.

gordonisnz said:
as light doesn't pass through things (IE a thick piece of paper), does light just stop traveling & cease to exist (after lighting up the object being hit)...
You could say that. The light gets absorbed.

gordonisnz said:
what happens to the atoms making up the light after the light stops / ends. ?
Light isn't made of atoms. If you mean the atoms that interacts with the light, three things can happen: a) An electron is emitted by the atom, b) An electron moves up to a higher energy level. It will sooner or later fall back down, and when that happens, light is emitted so that energy is conserved, c) the atom gets a different momentum (the total momentum must be conserved). A photon with really absurd amounts of energy (an absurdly short wavelength) could do other things, like smash the nucleus to pieces, but that probably hasn't happened since some small fraction of a second after the big bang.

gordonisnz said:
I guess some scientific paper has already been written about the above questions...
Yes. :smile:
 
Most people actually get confused when they come across the study of the DUAL NATURE OF LIGHT.Light is actually all about photons.

Now as you meant to be BLOWN AWAY by the intensity of light :p
consider the wavelength of light, you will get your anwer yourself.

Light is sometimes a very astonishing thing to think about !
:)
 

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