Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
On 2012, Mar 29, , at 21:49, Ludwik Kowalski wrote:
P.S.
Looking at the Figure 1 again I think that the amplitudes of fluctuations would be much smaller that 22%, if one was measuring temperatures, rather than light intensities. Yes I am thinking about the T^4 law. The tungsten spiral filament probably behaves nearly as if it were an ideal black body.
The challenge is how to measure the temperature without depending on radiation. What about plotting the R(t), where R is the resistance = v/i? The dependence of R on temperature is nearly linear, in a narrow range of T.
Ludwik
Looking at the Figure 1 again I think that the amplitudes of fluctuations would be much smaller that 22%,
According to Levi (Applied Optics) probably so. Here's the graph:
http://www.cleyet.org/Misc._Physics/Lamp%20flicker(D).tiff
bc thinks breaking the envelope and using micrometer calipers is the next step.
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l