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Question
In a triode, cathode, grid and plate are at 0,−2V and 80V respectively. The electrons is emitted from the cathode with energy 3 eV. The energy of the electron reaching the plate is
In a triode, cathode, grid and plate are at 0,−2V and 80V respectively. The electrons is emitted from the cathode with energy 3 eV. The energy of the electron reaching the plate is
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Solution
The correct option is C 83 eV
The triode with given specification can be shown as
There is a loss of kinetic energy of 2eV from filament to grid. The energy of the electron after passing through the grid will be 3−2=1 eV. The potential difference between plate and grid is 80−(−2)=82 V. The electron will gain energy 82 eV from the grid to the plate. The energy of electron reaching the plate =1+82=83 eV.
The triode with given specification can be shown as
There is a loss of kinetic energy of 2eV from filament to grid. The energy of the electron after passing through the grid will be 3−2=1 eV. The potential difference between plate and grid is 80−(−2)=82 V. The electron will gain energy 82 eV from the grid to the plate. The energy of electron reaching the plate =1+82=83 eV.
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