[" 42.A "100W" bulb has tungsten filament of total length "1*0m],[" and radius "4times10^(-5)m" .The emissivity of the filament is "],[0*8" and "sigma=6*0times10^(-8)Wm^(-2)K^(4)" .Calculate the "],[" temperature of the filament when the bulb is operating "],[" 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 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 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 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) .

An electric bulb with a tungsten filament has an area of 0.20 cm^2 and is raised to a temperature of the bulb to 3000 K emissivity of the filament is 0.40 and Stefan's constant is 5.7 xx 10^(-5) erg s^(-1) cm^(-1) K^(-4) . The electrical energy consumed by the bulb is E_1 watt. If due to fall in voltage, the temperature of the filament falls to 2800 K, then the wattage of the bulb is E_2 watt. Calculate the value of E_1 - E_2 , close to nearest integer.

A 60 watt filament lamp loses all its energy by radiation from its surface. The emissivity of the surface is 0.5. The area of the surface is 5 xx 10^-5m^3 . Find the temperature of the filament ( sigma = 5.67 xx 10^-8m^2s^-4K^-4 )