Light into Matter ? Possible ?

Discussion in 'Physics & Math' started by river, Oct 13, 2017.

  1. river Valued Senior Member

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    For myself I don't . But many think that all the Universe is , light .

    Matter to me is very much different . While frequences of the electromagnetic spectrum are inbedded IN matter , light itself cannot on its own , form matter , or an atom .

    Perhaps I'm wrong , but if I am , how so .
     
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  3. origin Trump is the best argument against a democracy. Valued Senior Member

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    Photons can create a particle anti particle pair. The photon must be higher in energy than visible light.

    Pair production.
     
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  5. DaveC426913 Valued Senior Member

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    It makes one wonder then, how you explain all elements in the universe heavier than iron.

    The heavier elements were formed by fusion in stars. The heavy elements produced (such as, say nickel or copper) have atomic masses greater than the two lighter elements that they were made from. The process is endothermic - meaning it consumes energy. The energy - which is photons - is converted to mass.
     
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  7. river Valued Senior Member

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    But is Fusion in stars provable ?
     
  8. Jordan.S Registered Member

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    Well what i was reading about recently is that in 2014, physicists at Imperial College London designed an experimental setup that could do just that. In the design, a particle accelerator would be built to collide high-energy photons rather than high-energy protons . Photons would be accelerated from two directions by a high-energy laser, and then smashed into gold plates. The stream of photons would pass through the plates into an evacuated gold chamber, creating collisions between photons. According to the setup, some of these collisions about 100,000 of them would result in the production of electrons and anti-electrons. It’s an exciting new idea, and several labs are working on the experimental design.
     
  9. origin Trump is the best argument against a democracy. Valued Senior Member

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    Fusion is done on Earth in fusion reactor experiments.
     
  10. exchemist Valued Senior Member

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    What is more, we have just got a nice piece of experimental confirmation of the production of gold and other elements heavier than iron, in the gravitational wave event that has been in the press in that day or two. We have two neutron stars colliding, generating gravitational waves whose direction corresponds to a visible event in the sky, in which spectra of heavy metals can actually be seen.
     
    origin likes this.
  11. NotEinstein Registered Senior Member

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    Frequencies of the EM spectrum are embedded in matter? Please explain what you mean; are you talking about photons of specific frequencies?
     
  12. DaveC426913 Valued Senior Member

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    What do you mean "provable"?
    Do you mean are stars stars? Because what stars are are giant balls of fusing hydrogen.

    So yes. Stars are stars, and stars are provable.
     
  13. DaveC426913 Valued Senior Member

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    It doesn't really matter. The second, more important half of his statement is false.
     
  14. NotEinstein Registered Senior Member

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    True, but perhaps understanding the meaning of this first half will help us explain why (s)he stated the second half.
     
  15. Xmo1 Registered Senior Member

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    They are wrong to think the universe is light. Try this:
    https://en.wikipedia.org/wiki/Standard_Model
    A recently published physics primer might help. It might be a little difficult, but worth the effort in my opinion, to even slightly understand the soup (the universe). You get those 'Oh, that's why.' moments learning physics, because it exposes the basic principles found in other sciences.
    BTW, matter (the elements) is made of energetic particles. Maybe that is what was meant by frequencies embedded in matter. Stars are made mostly of hydrogen and helium atoms, which fuse at the temperatures and pressures of a star to make the elements.
     
    Last edited: Oct 19, 2017

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