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NEET 2023 · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2023

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Photoelectric Effect: Einstein's Equation

The work functions of Caesium $(\text{Cs})$ , potassium $(\text{K})$ and Sodium (Na) are $2.14\text{ eV}, 2.30\text{ eV}$ and $2.75\text{ eV}$ respectively. If incident electromagnetic radiation has an incident energy of $2.20\text{ eV}$ , which of these photosensitive surfaces may emit photoelectrons?

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Answer: (d)

Emission needs photon energy $\ge \phi$ .
$2.20\text{ eV} > 2.14\text{ eV}$ (Cs) but $< 2.30\text{ eV}$ (K) and $< 2.75\text{ eV}$ (Na).
So the answer is (d) Cs only.

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