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.

The saturation current from a thoriated-tungsten cathode at 2000 K is 100 mA . What will be the saturation current for a pure-tungsten cathode of the same surface area operating at the same temperature? The constant A in the Richardson-Dushman equation is 60 xx 10^4 A m^(-2) K^(-2) for pure tungsten and 3.0 xx 10^(4) A m^(-2) K^(-2) for thoriated tungsten. The work function of pure tungsten is 4.5 eV and that of thoriated tungsten is 2.6 eV .

The saturation current from a thoriated-tungsten cathode at 2000 K is 100 mA . What will be the saturation current for a pure-tungsten cathode of the same surface area operating at the same temperature? The constant A in the Richardson-Dushman equation is 60 xx 10^4 A m^(-2) K^(-2) for pure tungsten and 3.0 xx 10^(4) A m^(-2) K^(-2) for thoriated tungsten. The work function of pure tungsten is 4.5 eV and that of thoriated tungsten is 2.6 eV .

The constant A in the Richardson-Dushman equation for tungsten is 60 xx 10^(4) A m^(-2) . The work function of tungsten is 4.5 eV . A tungsten cathode having a surface area 2.0 xx 10^(-5) m^2 is heated by a 24 W electric heater. In steady state, the heat radiated by the cathode equals the energy input by the heater and the temperature becomes constant. Assuming that the cathode radiates like a blackbody, calculate the saturation current due to thermions. Take Stefan constant = 6 xx 10^(-8) W m^(-2) K^(-4) . Assume that the thermions take only a small fraction of the heat supplied.

The constant A in the Richardson-Dushman equation for tungsten is 60 xx 10^(4) A m^(-2) . The work function of tungsten is 4.5 eV . A tungsten cathode having a surface area 2.0 xx 10^(-5) m^2 is heated by a 24 W electric heater. In steady state, the heat radiated by the cathode equals the energy input by the heater and the temperature becomes constant. Assuming that the cathode radiates like a blackbody, calculate the saturation current due to thermions. Take Stefan constant = 6 xx 10^(-8) W m^(-2) K^(-4) . Assume that the thermions take only a small fraction of the heat supplied.

A photon of wavelength 4 xx 10 ^(-7) m strickes on metal surface, the work function of the metal being 2.13 eV. Calculate the kinetic energy of the emission

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 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 .

A photon of wavelength 4xx10^(-7)m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate (1) the energy of the photon (eV). (2) The kinetic energy of the emission.

A photon of wavelength 4xx10^(-7)m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate (1) the energy of the photon (eV). (2) The kinetic energy of the emission.

A photon of wavelength 4 xx 10 ^(-7) m strickes on metal surface, the work function of the metal being 2.13 eV. Calculate the velocity of the photoelectron (1 eV = 1. 6020 xx 10 ^(-19) J)