sr.vinay

The source loses mass that is converted into photons. So, this can be converted back to mass?

That's my question. Where does the initial energy come from? Why and how do we consider a closed system?

Can you suggest some website that explains in detail the structure(if any) and properties of a photon?

Thus there is no friction at all? What about when strings split up? The divided strings do have different frequencies, yes, but isn't a lot of energy lost there?

I do agree that they do have mass. But, is it possible to convert most of their energy into mass again? Though maybe not directly?

Could you explain how negative refractive indices are achieved?

But never such low energy that it should fall into the nucleus?

Time travel is impossible. First of all, we know that to travel at the speed of light, which would make time travel possible, would require our mass to be really small. Really small. We would just burn at high speeds due to excessive areas of contact creating friction.

According to the law of conservation of mass and energy, they can just be inter-converted. Thus, considering photons to be completely energy, is it possible to slow them down and then convert them to mass (however small it may be)?

We've all heard of the string theory and its reputation as the theory of everything. My question is that, according to the theory, strings are in continuous vibration. Is this vibration due to external energy supplied to it? If not, will it disobey the law of conservation of energy? Because they're in vibration all the time. Consider the theory to be true and answer this.

Oh, okay. Thanks for that. Are electrons ever capable of ever expelling all their energy?

Could you elaborate? Isn't ground state still a theory?

Infinity till date has been theoretical, for we do not know beyond what we see. As in, we've not built telescopes that can capture images beyond a few solar systems or galaxies. This being said, we don't know the exact boundaries, if any, that define the universe. This would make infinity just a theory. For there cannot be something infinite derived from things we've measured.

Nice argument. But what I think is that the electromagnetic field, as we've learnt is continuously alternating. This should mean that the fields by themselves propagate along with each other, thus proceeding till the energy is sufficient.

If the strengths of magnets you are joining is the same, then the power will not double. It's because it'll just act as one big magnet. The power will increase in a ratio with which the size increases. If the powers are different, even then joining won't double directly, but increase with certain ratios.

How come electrons still have energy left? They should've expelled all their energy to the surroundings as 0K is a temperature that's obviously the lowest possible. From thermodynamics, if the surrounding temperature is maintained at 0K, all energy from the system should be expelled to the surroundings. And, about the big bang, since the density shall become infinite; with electrons still vibrating, when the volume becomes 0, they should start colliding such that mass is thrown outwards. Sort of a bang. Merged post follows: Consecutive posts merged Since 0K has never been achieved, it can't be said that electrons can still remain in their ground states.

At 0K(though impossible to achieve), bodies are at their lowest energy states as they've expelled their energy to the surroundings. This should mean electrons lose their energy too and fall into the nucleus. Or, atoms can collide with each other as the density is infinite. This can create a big bang. Thus, big bang at 0K? Is this one reason that 0K can't be achieved?