If the temperature of a tungsten filament is raised from `2000 K to 2010 K`, by what factor does the emission current change? Work function of tungsten is `4.5 eV`.

If the temperature of a black body is raised from 300K to 600K by what factor the rate of emission shall increase ?

ZrI_(4) is heated over a tungsten filament at 2075K

In a diode valve the saturation current at 750 K is 100 mA. What is the saturation current at 800 K ? Work function of metal is 1.6 eV.

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 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 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)

The constant A in the Richordson-Dushman equation is 60 xx 10^4 A m^(-2) K^(-2) for tungsten. A tungsten cathode has a total surface area of 2.0 xx 10^(-5) m^2 and operates at 2000 K . The work function of tungsten is 4.55 eV . Calculate the electric current due to thermionic emission.