Physics Heat & Thermodynamics Level: High School

(a) A heat source has its radiation maximum when the wavelength is 1.8 micro m . Calculate the temperature of the heat source .

(b)If the absolute temperature of a black of body is doubled , by what factor does the total power increase ?

(c)A tungsten filament of an incandescent bulb is a wire diameter 0.1 cm . length 10 cm and acts like a black body . Calculate the power radiated from the surface of the filament when its temperature is 2000 degreeK . Neglect any radiation from the two contact (cross –sectional area )points .