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CSE · Paper II · Quantum Mechanicscse-2026-subject-05-001

De Broglie wavelength — UPSC Physics Optional CSE 2026 Paper II

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The de Broglie wavelength of a particle in thermal equilibrium at a temperature of 27\text{ }^\circ\text{C} is \lambda. At what temperature will it be \dfrac{\lambda}{2}?

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