Thermal Radiation
Medium
Radiated Power Emissivity Calculation
A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727°C and power radiated by the wire is 94.2 W. Its emissivity is 
where x =_____
(Given σ = 6.0 × 10–8 W m–2 K–4, π = 3.14 and assume that the emissivity of wire material is same at all wavelength.)
where x =_____(Given σ = 6.0 × 10–8 W m–2 K–4, π = 3.14 and assume that the emissivity of wire material is same at all wavelength.)