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(B) The process of emitting electrons from a metal surface by applying a strong external electric field is known as field emission. For a typical meta

Vedclass · Accepted Answer

$10^{8} \,V \,m^{-1}$

Vedclass · Answer

(B) The process of emitting electrons from a metal surface by applying a strong external electric field is known as field emission. For a typical metal, the work function is a few electron volts $(eV)$. To overcome this potential barrier and pull an electron out of the metal surface, an electric field of the order of $10^{8} \,V \,m^{-1}$ is required. Therefore, the correct option is $B$.

To emit an electron from a metal surface, the minimum electric field required is . . . . . . .

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