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प्रश्न
What is the order of the electric field required for field emission?
विकल्प
\[10^{-8}\,\mathrm{V\,m^{-1}}\]
\[10^{8}\,\mathrm{V\,m^{-1}}\]
\[1\,\mathrm{V\,m^{-1}}\]
\[1.602\times10^{-19}\,\mathrm{V\,m^{-1}}\]
MCQ
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उत्तर
Field emission requires a very high electric field, of the order of \[10^{8}\,\mathrm{V\,m^{-1}}\]. This field can pull electrons out of the metal.
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