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Quantum physics

  1. Mar 29, 2010 #1
    Why can't energy is absorbed by protons rather than by electrons when a light ray strikes the atom.
  2. jcsd
  3. Mar 29, 2010 #2

    Light is absorbed when there is an excited state to go to.
    You can picture a proton as the ground state of the (uud) 3-quarks system. The first excited state of this system (if it exists at all… :confused: I don't know…) is very high in energy and unreachable by photons with “reasonnable” energies :smile:
  4. Mar 30, 2010 #3
    Protons can absorb photons too but it's easier for an electron to absorb it because it can move around
  5. Mar 30, 2010 #4


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    Staff: Mentor

    Nuclear energy levels are measured in MeV (millions of electron volts), whereas photons of visible light have energies of only a few eV.
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