[填空题]
A 100-W lightbulb ha0 z6k jdg.j daihqox70nkokp00a+;n 0s a 8q gvhph89 p2rresistance of about $12\Omega$ when cold ($20^{\circ}\,C$) and $140\Omega$ when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity $\alpha\,=\,0.0060(C?)^{-1}$ . $^{\circ}\,C$
