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Michael hits the nail on its head, as usual. The filament temperature_______________________________________________
increases monotonically in time, and so too does the brightness of
the filament. However, before Michael pointed out what the actual
question was I didn't see it. John Denker's question would be a good
one to use on students for teaching purposes, but not on examinations
to test their knowledge of physics.
Leigh
Michael Edmiston said:
What's the primary point of interest here? Is it the question of
whether the light bulb is momentarily brighter when turned on?
If that's it, I am aware that some people believe they observe this.
But I think it's because the light bulb got to its full brightness
before the irises of their eyes closed down. If the room is not real
bright, and you stare at a bulb as it is turned on, you will have the
impression that it got real bright at first and then dimmed. I think
this is a biological phenomenon in the eye rather than physical
reality
in the light bulb. I don't see how the bulb could overshoot the
equilibrium brightness, but I have to admit I have never recorded the
brightness of a light bulb turning on.
Michael D. Edmiston, Ph.D.