Q82 · CSIR NET Chemistry, June 2012
Paper: CSIR NET June 2012 · Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Hydrogen Atom · Marks: 2 · Difficulty: Medium
The average value of the radius $<\mathrm{r}>$ in the 1 s state of the hydrogen atom is ( $\mathrm{a}_{0}$ is Bohr radius)
(a)$\mathrm{a}_{0}$
(b)$1.5 \mathrm{a}_{0}$
(c)$0.75 \mathrm{a}_{0}$
(d)$0.5 \mathrm{a}_{0}$
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
⟨r⟩₁ₛ = (3/2)a₀ (the most probable radius is a₀).
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