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JEE Main 2025 (22 Jan, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from JEE Main 2025 (22 Jan, Shift 1)

Q33JEE Main 2025 · 22 JAN · SHIFT 1Easy

Photoelectric Effect: Einstein's Equation

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surfaces, then photo-electric effect is possible for the case of

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Answer: (d)

Photon energy $E = \dfrac{1240\text{ eV nm}}{550\text{ nm}} \approx 2.25\text{ eV}$
$2.25 > 1.9$ (Cs) but $< 2.5$ (Li).
So the answer is (d) Cs only.

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