Q65 / 75 · JEE Main 2025 (22 Jan Shift 1) · Physics

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

A
Both Cs and Li
B
Neither Cs nor Li
Correct answer
C
Cs only
D
Li only

Solution

\(E=\frac{1240 \mathrm{eV} \cdot \mathrm{~nm}}{550 \mathrm{~nm}}=2.25 \mathrm{eV}\) Possible for \(C_s\) as \(E > \phi_{c s}\) Not for Li as \(E < \phi_{L i}\)

Hence, the correct answer is option: 'C'.

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