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Question

The work function of cesium metal is 2eV. It means that

A
The energy necessary to emit electrons from metal surface is 2eV
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B
The energy of electrons emitted from metallic surface is 2eV
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C
The value of photoelectric current is 2eV
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D
The value of threshold frequency is 2eV
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Solution

The correct option is A The energy necessary to emit electrons from metal surface is 2eV
By definition the work function is the minimum energy (in electron volts) needed to remove an electron from a solid to a point immediately outside the solid surface (or energy needed to move an electron from the Fermi level into vacuum).
Hence, if t
he work function of cesium metal is 2ev, it means that the energy necessary to emit electrons from metal surface is 2eV.
So, the answer is option (A).

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