Question 1: I really wish I knew the answer to this question, but unfortunately I don't. I believe that the inverse-square relationship would hold true for all point sources of light. My best guess is that it might not hold true for lights in which the rays are directed in only one direction instead of being allowed to spread out in all directions. This might be the case for laser lights or for certain types of spotlights, as long as the light intensity is measured at an angle other than straight on.
Question 2: I do have some Vernier LabPros and probeware, but I do not have light sensors, so I do not think I will be able to use the light activity in my classes. I really enjoyed the density activities and I cover density in several of my classes. In the past I have not had my students use Excel to make and analyze graphs of their data because I am not that knowledgeable about Excel myself. That part of the density lab was very helpful to me and it will definitely be something I will include from now on when doing this and other kinds of data-collecting labs.
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