A 100W bulb has tungsten filament of total length `1.0m` and raidius `4xx10^(-5)m` . The emiswsivity of the filament is `0.8` and `sigma=6.0xx10^(-8)Wm^(-2)K^(-4)` . Calculate the temperature of the filament when the bulb is oprating at correct wattage.

A 100W bulb has tungsten filament of total length 1.0m and radius 4xx10^(-5)m . The emissivity of the filament is 0.8 and sigma=6.0xx10^(-8)Wm^(-2)K^(-4) . Calculate the temperature of the filament when the bulb is operating at correct wattage.

A bulb made of tungsten filament of surface are a 0.5cm^(2) is heated to a temperature 3000 K when operatred at 220V . The emissivity of the filament is e=0.35 and take sigma=5.7xx10^(-8)mks units . Then calculate the wattage of the bulb (in watt)

A bulb made of tungsten filament of surfece area 0.5 cm^2 is heated to a temperature 3000K when operated at 220V.The emissivity of the filament is in=0.35 and take sigma=5.7xx10^-8 mks units. Then the power of the bulb is,

The tungsten filamet of an electric lamp, has a length of 0.25 m and a diameter of 6xx10^(-5) m. The power rating of the filament is 0.8, estimate the steady temperature of filament. Stefan's constant =5.67xx10^(-8) W//m^(-2)//K^(4) .

The radiant power of a furnace of surface area of 0.6m^(2) is 34.2KW The temperature of the furance s [sigma = 5.7 xx 10^(-8) Wm^(-2) K^(-4) .

The emissivity and surface area of tungsten filament of an electric bulb are 0.35 and 0.25 xx 10^(-4) metre^(2) respectively. The operating temperature of filament is 3000 K. If sigma = 5.67 xx 10^(-8) watt melre^(-2) K^(-4) , then power of bulb is approximately:

A comon flashlight bulb is rated 0.30A and 2.7V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20^(@)C is 1.0Omega and its temperature coefficient of resistivity is 4.0 xx 10^(-3)C^(-1) , then find the temperature in centigrade of the filament when the bulb is on. (Consider the variationi of resistance to be linear with temperature.)