The operating temperature of an in candescent bulb (with tungsten filament) of power 60 W is 3000 K. If the surface area of the filament be 25 `mm^2`, find its emissivity e.

The temperature of the tungsten filament of a 60 W electric bulb is T= 2000 K. Find the surface area ofthe filament. The emmissivity of the surface is e= 0.30. Neglect radiation received from surrounding. Take sigma=5.7xx10^(-8)w//M^(2)k.

The operating temperature of a tungsten filament in an incandescent lamp is 2000 K and it's emissivity is 0.3 . Find the surface area of the filament of a 25 watt lamp. Stefan's constant sigma = 5.67 × 10^-8 W m^-2 K^-4

The temperature of the tungsten filament of a 60-watt electric bulb is T=2000K . Find the surface of the filament. The emmissivith of the surface is e=0.30 .

The operating temperature of a tungesten filament in an indandescent lamp is 2000 K and its emissivity is 0.3 . Find the surface area of the filament of a 25 watt lamp. Stefan's constant sigma = 5.67xx10^(-8) Wm^(-2)K^(-4)

The operating temperature of a tungesten filament in an indandescent lamp is 2000 K and its emissivity is 0.3 . Find the surface area of the filament of a 25 watt lamp. Stefan's constant sigma = 5.67xx10^(-8) Wm^(-2)K^(-4)

The operating temperature of a tungesten filament in an indandescent lamp is 2000 K and its emissivity is 0.3 . Find the surface area of the filament of a 25 watt lamp. Stefan's constant sigma = 5.67xx10^(-8) Wm^(-2)K^(-4)

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 .

An incandescent light bulb has a tungsten filament that is heated to a temperature 3xx10^(3)K when an electric current passes through it. If the surface area of the filament is approximately 10^(-4)m^(2) and it has an emissivity of 0.32, the power radiated by the bulb is