GATE Quantum Mechanics: uncertainty principle – Previous Year Questions

2 GATE previous year questions on uncertainty principle (Quantum Mechanics, Physics) with answers and explanations, from every paper.

1. GATE 2022 PH Q33 (1 mark, Numerical answer) – A pulse lasts 10-3 s. Photon momentum uncertainty is of order 10-N kg m/s. Find N, using c=3108 m/s and h=6.610-34 J s.
2. GATE 2026 PH Q52 (2 marks, Multiple select) – Consider operators A, B, and C for three observables of a quantum system satisfying [ A, B]=0, [ B, C]=0, and [ A, C]0, with uncertainties A, B, C,…