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Re: [Phys-l] Hewitt's three answers


On 2012, Mar 28, , at 15:54, Robert Cohen wrote:

I must admit I had the same doubt as Ludwik and figured it depended on
what one means by "flash". After all, if I take a bulb and "wave" it
back and forth, I don't see flashes like those I see with an LED light.
However, I searched for a slow motion video of an incandescent bulb and
found a couple that showed a noticeable flicker, if not a flash. Does
it depend on the type of incandescent bulb?

Robert A. Cohen, Department of Physics, East Stroudsburg University
570.422.3428 rcohen@esu.edu http://www.esu.edu/~bbq



Does
it depend on the type of incandescent bulb?

Por supuesto.

Low thermal inertia, i.e. low mass of W.

A carbon filament will have much more "flicker", no?

bc has several carbon lamps, so will try, IER.


Note: a discharge lamp will have even more for an obvious reason -- relaxation time, plus the extinction at say 80V for an NE-2. Another thing to do. My new Canon has a low res. 200 fps -- should do.