Expanding Universe

Singularity,

Not quite. Whenever an electron moves between the different orbits of an atom, they emit or absorb a photon (depending on whether they are moving to a higher energy orbit or a lower energy one). The net effect is always "0".

As far as decaying goes, protons are the longest "living" subatomic particles and they decay after about 30 billion years. So given that the age of the universe is about 14 billion years, we are about half way through the life of the universe.

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:itold:

 

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It is said that in nuke reactions some matter get converted in to energy. So if we have a very very power Light bulb (or its equivalent) that emits light (without nukes) equivalent to sun. Do u think there will be conversion of matter into energy in that case ?

 

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I'm not sure what you are asking. Do you want a light bulb as powerful as the sun? LOL!

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Truth seeker.

Cocked up my post in reply to oscillating universe, it ended up on page 5.

 

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Tell me , when fantastic amounts of energy is converted into light (without nuke reactions), do we loose some matter ?

 

I think most all of us have considered this question when we were getting interested in physics. I know I have in the past.

The first thing to think about is how 'energy' is converted into light. Stars, of course, shine mostly through nuclear reactions producing heat. Heated objects give off radiation, but it takes some form of energy to produce the heat, a balancing act as far as the emitted photons (energy) is concerned. The emitted photons can heat other objects, causing them to give up the absorbed energy as new photons, or the photons can be reflected, such as moonshine. So, if a body is not (1) absorbing then re-emitting external photons, (2) reflecting external photons, or (3) does not have an internal process generating heat through energy usage, then how can it emitt photons? It would be a blackbody. If you think about your lightbulb, it is using external energy (electricity) to heat the filament in the bulb.
These are very simplified examples, but I am a simple person.

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2inquisitive,

Are u implying that light cannot be generated without destroying some electrons somewhere ?

 

I'm not even sure what you are speaking of. Electrons emit a photon when they drop to a lower orbital. In a 'cold' atom, the electrons are in their lowest orbital, they cannot drop any further. If the atom absorbes a photon, the electron moves to a higher orbital, then may either emit a photon with the identical energy when it drops back to the lower orbital, or store the absorbed photon as energy which heats the atom. An already 'hot' body will emit photons and cool as it does so, until it is thermally stabilized with its enviroment.

Or are you thinking of 'using' the electrons in an electric current to generate heat?

 

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I dont know, but i think when sun emits EM energy, its all the extra electrons that get consumed in production of these photons during the nuclear fusion.

So i was wondering if the universe is getting positively charged and ( repelling ) expanding.

 

The thing to understand is that NO electrons are "consumed" in producing a photon - not even one. The electron drops from a higher energy level to a lower one, releasing energy only in the form of a photon.

In very real sense, you could compare it to water being held in a reservoir. When it passes down through a turbine, generating electricity, and flows out into the river below, non of the water has been consumed. It merely transfered it's kinetic energy as it traveled from one level to another - physically - and nothing was destroyed. Energy was simply converted. It's precisely the same with the electron and it's generating a photon. Energy transformation only.

 

I already said that the electrons only change orbits. They are not converted to anything. They are not lost. :bugeye:

 

Were you replying to me or Singularity? My post was a reply to her question since she didn't seem to be grasping what you and everyone else were saying.