Question Bank NAT • 2 Marks Section 4: Quantum Mechanics Angular momentum

QB_PH_117: Angular momentum

Question Statement

The projection operator $P_+ = |\uparrow\rangle\langle\uparrow| = \frac{1}{2}(I + \sigma_z)$ has trace equal to:
Correct Answer
1, 1
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: $\text{Tr}(P_+) = \frac{1}{2}(2 + 0) = 1$.
← Prev (QB_PH_116) Next (QB_PH_118) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and official TCS iON calculator.

Launch CBT Mock Test