by applying electric field of the order of _____V/m to a metal electron can be pulled out of the metal
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Explanation:
In question statement it is not defined that which metal is under consideration. However answering in general, a typical metal needs around 108 V/m of electric energy, if an electron has to be taken out from it
A similar concept is with photo electrons, these require solar energy for their emission and find application in photovoltaic cells
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