Units & Dimensions question from JEE Main 2026 (4 Apr, Shift 2)

Answer: (a)

1. Planck's constant $= [\mathrm{ML^2T^{-1}}]$ → III.
2. Stopping potential is a voltage $= W/q = [\mathrm{ML^2T^{-3}A^{-1}}]$ → IV.
3. Work function is an energy $= [\mathrm{ML^2T^{-2}}]$ → I.
4. Threshold frequency $= [\mathrm{T^{-1}}]$ → II.
5. So the answer is (a) A-III, B-IV, C-I, D-II.