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PhysicsJEE Main 5 Apr 2026, Shift 1·Q16·MCQ·Easy–moderate

Dual Nature of Radiation and Matter · Photoelectric effect

Light source having wavelength 331 nm is used to generate photo-electrons whose stopping potential is 0.2 V. The work function of the used metal in the experiment is α×10−19\alpha\times10^{-19} J. The value of α\alpha is . (h=6.62×10−34h = 6.62\times10^{-34} J s, e=1.6×10−19e = 1.6\times10^{-19} C and c=3×108c = 3\times10^{8} m/s)
  1. (1)3.68
  2. (2)4.68
  3. (3)5.68
  4. (4)2.68

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