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प्रश्न
State two characteristics of a good thermion emitter.
State the characteristics required of good thermion emitter
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उत्तर
Characteristics of a good thermion emitter:
1) The work function of the substance should be low so that electrons may be emitted from it even when it is not heated to a high temperature.
2) The melting point of the substance should be high so that it may not melt when it is heated to the temperature required for thermionic emission.
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