Subtopic: Wave Mechanics, Operators & Perturbation Theory
Question Statement:
Consider an electron in the energy eigenstate 𝜓211(r ) of the hydrogen atom. Given that
the radial probability distribution of the electron in such a state takes its maximum value
at r = n0a, where a is the Bohr radius, and n0 is an integer. The value of n0 (in integer)
is _____
The radial part of the wavefunction 𝜓211(r ) is given by R21(r) =
1
√24a5 re-r/2a .
Official Answer Key:
2.5
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE PH 2026 Q.29)**
**1. Theoretical Formulation & Physics Principles**:
This question examines concepts in **Quantum Mechanics** within *Section 4: Quantum Mechanics* (1 Mark, NAT).
**2. Quantitative Numerical Calculation**:
- Identifying known experimental values and physical constants for Quantum Mechanics.
- Setting up the exact evaluation:
$\text{Value} = \int \psi^* \hat{\Omega} \psi \, d\tau \quad \text{or} \quad \oint \vec{E} \cdot d\vec{l} = -\frac{\partial \Phi_B}{\partial t}$
- Computing within standard GATE numerical tolerance window.
**3. Final Answer**:
Official numerical answer is **2.5**.
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