Recent content by kevincb672

  1. kevincb672

    Calculating attenuation necessary to reduce number of photons

    :headbang:Correcting that silly error gets me the right answer as you had. I will refer myself back to primary school.
  2. kevincb672

    Calculating attenuation necessary to reduce number of photons

    my wrong workings out but corrected now, your logic of "Imagine you shoot the beam into space for one second. How long is the beam in meters and how many photons are in it?" went straight over my head but I get it now! Ah okay, I see! That helps me out. I can't understand why I didn't put two...
  3. kevincb672

    Calculating attenuation necessary to reduce number of photons

    With a length to detector 2m is it correct to say the beam has 1.63398693×10(^16) photons? Apologies for my own ignorance. Hi that does look right! Do you mind running through this a little bit, just so I can grasp it entirely :nb), thanks again..
  4. kevincb672

    Calculating attenuation necessary to reduce number of photons

    Hi there. I am attempting to do calculations for my own project, the question being what is the attenuation necessary to reduce the number of photons in a beam to single-photon levels. N approximately 1 or 2. The laser in question is a 650nm 5mW laser. I have solved the energy per photon...
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