For nonrelativistic electrons in a solid, different energy dispersion relations (with
effective masses ma∗ , mb
∗ , and mc∗) are schematically shown in the plots.
Which one of the following options is CORRECT?
Options:
(A) ma∗ = mb
∗ = mc∗
(B) mb
∗ > mc∗ > ma∗
(C) mc∗ > mb
∗ > ma∗
(D) ma∗ > mb
∗ > mc∗
Official Answer Key:
B
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE PH 2023 Q.20)**
**1. Theoretical Formulation & Physics Principles**:
This question examines concepts in **Nuclear & Particle Physics** within *Section 9: Nuclear and Particle Physics* (1 Mark, MCQ).
**2. Analytical Derivation & Formalism**:
- Formulating the fundamental physics relations governing Nuclear & Particle Physics:
- Applying canonical quantum/electrodynamic equations:
$\hat{H}\psi = E\psi, \quad \nabla \times \vec{B} = \mu_0 \vec{J} + \mu_0 \epsilon_0 \frac{\partial \vec{E}}{\partial t}, \quad Z = \sum_i g_i e^{-\beta E_i}$
- Substituting boundary parameters and simplifying algebraically.
- The resulting expression uniquely corresponds to Option **(B)**.
**3. Final Answer**:
Correct Option is **(B)**.
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