Recent content by Ralf66

  1. R

    Undergrad Photons striking a camera sensor?

    I am curious as to roughly how many photons strike a camera sensor (e.g. a DSLR) in dim light, where the camera can form an image? Also how many photons are hitting a photosite for it to be triggered? and... how many photons have to hit a human rod (or cone) cell for it to be triggered and...
    • Ralf66
    • Thread
    • Camera Photons Sensor
    • Replies: 2
    • Forum: Optics
  2. R

    XP Laptop cannot access network

    I used the same cable and it worked on another laptop, as per the OP. any ideas on what I can do to the Dell laptop?
  3. R

    XP Laptop cannot access network

    My ancient Dell laptop used to work fine, but now I cannot access ethernet network we're on. It claims the speed is 1 Gbyte or 1 GHz too. I checked the connection by bringing in my MacBk Pro but that is not a viable option for this location. We have no "UT person" - it is roll your own. Any...