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प्रश्न
What causes field emission?
विकल्प
Light of suitable frequency falling on a metal surface
A potential difference of 1 volt defining an electron volt
Heating a metal filament
A very strong electric field applied across the metal surface
MCQ
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उत्तर
In field emission, a very strong electric field pulls electrons out of the metal. Heating and suitable light correspond to different emission methods.
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