Example of the Stefan-Boltzmann law
Suppose a brown-out causes the
temperature of a lamp filament to drop to
0.9 of its original value.
By what factor
does the light output of the lamp drop?
Using the Stefan-Boltzmann law (with the
numerical value of
we could have
calculated how big (in m
) a light filament
would have to be to emit 100 W of light, at
any given temperature.
We could also use it to find the size of a
star, if we know how much light energy
that star emitted
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