If a body having a surface area `5 cm^2` and a temperature of `727^@C` radiates 300 joule of energy each minute, then emissivity is `(sigma = 5.67 10^(-8) W/m^2 sK^4)`

A 10w electric bulb has tungsten filament of surface area 5 xx 10^(-5) m^2 . What is the temperature of the filament when incandescent ? Emissivity of the filament is 0.35 and Stefan's constant is 5.67 xx 10^(-8) Jm^(-2) s^(-1) k^(-4) .

Calculate the energy radiated in two minute by a black body of surface area 400 cm^2 when it is maintained at 127^@C (Stefan's constant sigma = 5.7 xx 10^(-8) J/sm^2k^4 )

Silver is electrolytically deposited on a metallic vessel of total surface area 900 c m^(2) by passing a current of 0.5A for 2h. Calculate the thickness of silver deposited . Given, density of silver =10.5 g c m^(-1) . Atomic mass of silver = 108u, F = 96500 C "mol"^(-1)

Calculate temperature at perfectly black body radiates energy at the rate 5.67 xx 10^4 W/m^2 .

Calculate power in watts radiated from a filament of an lamp at 2000 k, if the surface area is 0.5 cm^2 and its emissivity is 0.85 .