Dual Nature of Radiation and Matter

JEE Main 2025 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 32% papers+4−1

Ques. 1JEE Main 2025, 23 January (Evening Shift)

In photoelectric effect an em-wave is incident on a metal surface and electrons are ejected from the surface. If the work function of the metal is 2.14 eV and stopping potential is 2 V, what is the wavelength of the em-wave? (Given hc=1242 eV nm where h is the Planck's constant and c is the speed of light in vacuum.)

400 nm
600 nm
300 nm
200 nm

Answer

(3) 300 nm

Solution

Einstein: hc = +eV0=2.14+2=4.14 eV

= 12424.14=300 nm

Answer: (3)

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Ques. 2JEE 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

Ques. 3JEE 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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