To emit an electron from a metal surface, the minimum electric field required is . . . . . . .
- A$10^{6} \,V \,m^{-1}$
- B$10^{8} \,V \,m^{-1}$
- C$10^{5} \,V \,m^{-1}$
- D$10^{4} \,V \,m^{-1}$
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