conversations list |
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[
{
"from": "human",
"value": "The filament of a light bulb has surface area $64 \\mathrm{~mm}^{2}$. The filament can be considered as a black body at temperature $2500 \\mathrm{~K}$ emitting radiation like a point source when viewed from far. At night the light bulb is observed from a distance of $100 \\math... |
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