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PhysicsJEE Main 21 Jan 2026, Shift 1·Q12·MCQ·Moderate

Dual Nature of Radiation and Matter · Photoelectric effect

A light wave described by E=60[sin⁡(3×1015t)+sin⁡(12×1015t)]E = 60[\sin(3\times10^{15}t) + \sin(12\times10^{15}t)] (in SI units) falls on a metal surface of work function 2.8 eV. The maximum kinetic energy of ejected photoelectron is (approximately) eV. (h=6.6×10−34h = 6.6\times10^{-34} J-s. and e=1.6×10−19e = 1.6\times10^{-19} C)
  1. (1)5.1
  2. (2)3.8
  3. (3)6.0
  4. (4)7.8
We corrected a printing error in the original paper

Source printed “E=60sin⁡(3×1015)t+sin⁡(12×1015)t]E = 60\sin(3\times10^{15})t + \sin(12\times10^{15})t]”.

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