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B How do we detect photons?

  1. May 15, 2016 #1
    How can we detect photons without mass ?

    In the experiment that was showing two photons hitting the detector when only 1 was fired through the slit, how did technology detect photons without mass to hit the detector ?
     
  2. jcsd
  3. May 15, 2016 #2

    Nugatory

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    Staff: Mentor

    Google for "photomultiplier".
    Or you can use a piece of photographic film. When you develop the film, you get a dot wherever a photon landed.

    However, I'm not sure which experiment you mean when you're asking about "the experiment that was showing two photons hitting the detector when only 1 was fired through the slit"
     
  4. May 15, 2016 #3
    Your phone camera is a photon detector more common than PMT. Easy to Google.
     
  5. May 15, 2016 #4

    Drakkith

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    Photons still have energy and momentum, despite having zero mass. Thus they can still be detected.
     
  6. May 15, 2016 #5

    Vanadium 50

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    And your eye is more common than your phone camera.
     
  7. May 15, 2016 #6
    And green leaves are more common than eyes.
     
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