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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.)

  1. 400 nm
  2. 600 nm
  3. 300 nm
  4. 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

  1. Both Cs and Li
  2. Neither Cs nor Li
  3. Li only
  4. 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 )

  1. 5 eV
  2. 3 eV
  3. 2 eV
  4. 6 eV

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