Dual Nature of Radiation and Matter

JEE Main 2025 (Online) 22nd January Morning ShiftMCQEasy📈 Topic in 32% papers+4−1

Ques. 1JEE Main 2025, 22 January (Morning Shift)

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

Both Cs and Li
Neither Cs nor Li
Li only
Cs only

Answer

(4) Cs only

Solution

Photon energy E= hc = 1240550 2.25 eV; emission needs E .

[figure]

Cs: 2.25>1.9 eV emission

Li: 2.25<2.5 eV no emission

Answer: (4)

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Ques. 2JEE Main 2025, 22 January (Evening Shift)

A light source of wavelength illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength 2, then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV )

5 eV
3 eV
2 eV
6 eV

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