Q138 · CSIR-NET Chemistry, June 2011

Paper: CSIR-NET June 2011 · Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Postulates Operators · Marks: 2 · Difficulty: Easy

A constant of motion is defined by the equation:

(a)$[\mathrm{H}, \mathrm{A}]=0$

(b)$\langle[\mathrm{H}, \mathrm{A}]\rangle=0$

(c)$\mathrm{A}=\mathrm{f}(\mathrm{H})$

(d)$\mathrm{A}^{\dagger}=\mathrm{A}$

Answer

Answer: A ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

A is a constant of motion when it commutes with the Hamiltonian, [H, A] = 0 (a).

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