1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

What is an X ray photon?

Discussion in 'General Discussion' started by SoSolid, 21 May 2006.

  1. SoSolid

    Wise Guy

    Joined: 28 Jul 2003

    Posts: 1,987

    Location: The Moon

    Is an X ray photon an electron?
     
  2. Socaddict

    Wise Guy

    Joined: 20 Feb 2006

    Posts: 1,203

    Location: London

    no, its still a photon, a light particle.
     
  3. SoSolid

    Wise Guy

    Joined: 28 Jul 2003

    Posts: 1,987

    Location: The Moon

    But aren't X rays electrons that have lost energy and the release of energy is the x ray?
     
  4. daz

    Capodecina

    Joined: 18 Oct 2002

    Posts: 23,972

    Location: Bucks

    X-rays are photons generated by firing electrons at metal.
     
  5. Socaddict

    Wise Guy

    Joined: 20 Feb 2006

    Posts: 1,203

    Location: London

    The release of electromagnetic energy is the x ray. This is a photon. Photons and electrons are two different particales, aand as you yourself asked if an X ray photon is an electron.

    http://en.wikipedia.org/wiki/X_rays

    A bit more info can be found there.
     
  6. SoSolid

    Wise Guy

    Joined: 28 Jul 2003

    Posts: 1,987

    Location: The Moon

    It's just that I am stuck on an A level physics question which gives me the energy of an x ray photon and asks me to calculate the speed of it. I was thinking if an x ray was an electron I could use e=mc^2 I can't think of any other way to work out the speed without knowing its wavelength or frequency?
     
  7. PhilthyPhil

    Mobster

    Joined: 19 Oct 2002

    Posts: 2,685

    Location: UK

    It's a photon so its speed=c :confused:
     
    Last edited: 21 May 2006
  8. MrMatteh

    Wise Guy

    Joined: 22 Feb 2004

    Posts: 2,418

    Location: Essex

    an x-ray photon would just just be a photon with a wavelength of what... 10^-9 - 10^-10

    you can calculate the frequency of them using f=c/λ

    not sure why you are being asked to work out the speed.. its a constant :o

    then just use e=hf to find the energy

    or just e=hc/λ

    an x-ray is just a photon with a specific wavelength

    just like radio waves are.. and visible light etc...

    edit: convenient: http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html
    check your answer against that (its in eV though, so don't forget to divide by 1.6x10^-19)
     
    Last edited: 21 May 2006
  9. Dave

    Mobster

    Joined: 30 Oct 2004

    Posts: 4,937

    Location: Sacramento CA

    You know E = hf = hc/(lambda) so you can work out the frequency.

    The de Broglie wavelength is (lambda) = h / p

    So, hc/E = h/p, i.e. p = E/c.

    Although being a photon, it's speed is c. You sure its asking to work out speed?
     
  10. MrMatteh

    Wise Guy

    Joined: 22 Feb 2004

    Posts: 2,418

    Location: Essex


    it has no m, it's a photon

    ah, ninja edit :p
     
  11. Socaddict

    Wise Guy

    Joined: 20 Feb 2006

    Posts: 1,203

    Location: London

    actually, quite a few A level physics questions will be these sort of trick questions for one or two marks.

    Check the question again.
     
  12. MrMatteh

    Wise Guy

    Joined: 22 Feb 2004

    Posts: 2,418

    Location: Essex

    trick question?

    e=hc/λ

    job done.
     
  13. Socaddict

    Wise Guy

    Joined: 20 Feb 2006

    Posts: 1,203

    Location: London

    speed, not energy. thats what he needs to find, apparently.
     
  14. MrMatteh

    Wise Guy

    Joined: 22 Feb 2004

    Posts: 2,418

    Location: Essex

    under most circumstances, the speed will be 3x10^8. I can't see that being the question

    perhaps its something to do with the photoelectric effect, difficult to tell from the OPs wording
     
  15. Socaddict

    Wise Guy

    Joined: 20 Feb 2006

    Posts: 1,203

    Location: London

    As someone who took A level physics only a year ago, I can attest to the fact that they do have these little trick questions.

    hence why I suggested it being one.
     
  16. Visage

    PermaBanned

    Joined: 13 Jan 2005

    Posts: 10,708


    Not quite. The method of creation has no bearing on the nature of the reulstant photon. X-Rays can also be created in inter-stellar collisions, for example, as measured by CHANDRA.

    To anser the OP, an X-Ray photon is simply a high energy photon.
     
  17. Visage

    PermaBanned

    Joined: 13 Jan 2005

    Posts: 10,708

    It may be questioning what the recoil velocity is - an atom of mass m emits a photon with energy E, at what speed does the atom recoil....that kind of question.
     
  18. MrMatteh

    Wise Guy

    Joined: 22 Feb 2004

    Posts: 2,418

    Location: Essex

    yups

    come on OP, tell us the whole question! :)
     
  19. AthlonTom

    Banned

    Joined: 22 Oct 2004

    Posts: 1,884

    Its a photon isn't it, oh and has anyone seen that X-Ray lazer majig?
     
  20. daz

    Capodecina

    Joined: 18 Oct 2002

    Posts: 23,972

    Location: Bucks

    I know it has no bearing on the resultant photon. However, what we define as X-rays and gamma rays overlap, the only difference being the method of creation.