How do we detect photons?

  • #1

Main Question or Discussion Point

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 ?
 

Answers and Replies

  • #2
Nugatory
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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 ?
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"
 
  • #3
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Your phone camera is a photon detector more common than PMT. Easy to Google.
 
  • #4
Drakkith
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How can we detect photons without mass ?
Photons still have energy and momentum, despite having zero mass. Thus they can still be detected.
 
  • #5
Vanadium 50
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Your phone camera is a photon detector more common than PMT.
And your eye is more common than your phone camera.
 
  • #6
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And green leaves are more common than eyes.
 

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