Recent content by Creator

  1. C

    A Does increasing photon flux density increase attenuation?

    I suggest you check the stability of your voltage supply and regulator to the lamps...Even though Halogens are suppose to be very stable, they are voltage sensitive. If you are using Tungsten halogen lamps the spectral output can be very sensitive to the energy supplied to (and the temperature...
  2. C

    B About gravitational attraction

    William; The force of gravity doesn't depend upon the weight of the object dropped. Watch what happens when a feather and a hammer are dropped by an astronaut on the moon (no wind or air resistance).: ://www.youtube.com/watch?v=5C5_dOEyAfk
  3. C

    Why do stronger red lasers not work in a Crookes radiometer?

    OK; Sorry, I made another mis-statement (but only in point #2). withregards to the experimental apparatus in the video my statement that "increase in pressure changes temp." is not necessarily true because the number of moles of gas, n, is not constant. However, it would be applicable to the...
  4. C

    Why do stronger red lasers not work in a Crookes radiometer?

    Yes, he did say 1 cm. - My mistake... BUT, The point I was making is that you CANNOT use the ambient temperature OUTSIDE the glass, especially in an OPEN system; at least not in his experimental set up because: 1. I don't think its possible for the INSIDE temp. to reach thermal equilibrium...
  5. C

    Why do stronger red lasers not work in a Crookes radiometer?

    The transmission of IR depeds upon the type of glass; here's great little tutorial showing the transmission of various materials at various IR wavelengths.: http://www.edmundoptics.com/resources/application-notes/optics/the-correct-material-for-infrared-applications/ I'll address some more...
  6. C

    Why do stronger red lasers not work in a Crookes radiometer?

    OMCheeto; the Video in your first post provided some excellent info...and the raw data chart was nice. Where did you get the data chart above? How long did you keep it in the freezer before measuring ? It has to reach equilibrium Temp. And of course, the temperature , even if accurately...
  7. C

    Why do stronger red lasers not work in a Crookes radiometer?

    Thanks, Simon, for resurrecting the original post by Peter Terren. I had just decided yesterday to get a radiometer and begin experimenting with lasers when I came across your post. The OP had lots of good info about laser interactions. If I am not mistaken, he came to the conclusion that his...
  8. C

    Stargazing Aaaannd.... here's Neptune

    Thanks Andy; In light of that article you linked with regards to eliminating blooming, it may be helpful to know precisely what you have: I'm not an imaging expert, but... ... do you know how many megapixels you have?? From this list of Sonys any sensor that has 12 MP or better appears to be...
  9. C

    Stargazing Aaaannd.... here's Neptune

    Nice pics, Andy. Do you have CCD or CMOS imaging?
  10. C

    Nice gravity experiment

    I kinda like this one:
  11. C

    Where can I get a cheap ceramic (hi temp.) superconductor?

    I used to have one for demonstration...need to find a current source ...maybe a small 1 inch diameter disk...or preferably a ring. Any sources? Thx.
  12. C

    Can Radio Telescopes Capture Detailed Images of Asteroids and Their Moons?

    Pretty awesome radio-photos , Greg. I was unaware about such small asteroids having moons... Furthermore, that is an incredible series of shots, and showing great detail. I wish they would have given the time between each frame so we could determine the rotation rate; it appears to be a shot...
  13. C

    Doubt about Frame Dragging and planetary revolution

    Very interesting, Steve... Furthermore, a prograde equatorial orbiting clock and a retrograde orbiting clock would have different proper periods, t, ... the difference given by ... (t+) −(t−) ≈ 4πJ/(Mc^2). And which, remarkably, is not dependent upon G or the orbital radius...as pointed out...
  14. C

    Vacuum Fluctuations and a Preferred Frame

    So you are saying that zero point energy doesn't exist?
  15. C

    Stargazing UY Scuti, the biggest known star, viewed through a telescope

    Fun Fact #2... apparently that "gas" contains molecular layers of H2O and CO. http://www.aanda.org/articles/aa/abs/2013/06/aa20920-12/aa20920-12.html
Back
Top