CSIR NET Physical Science Exam > CSIR NET Physical Science Videos > CSIR NET Crash Course for Physical Science > Time-dependent Perturbation Theory and Fermi’s Golden Rule, Selection Rules
Time-dependent Perturbation Theory and Fermi’s Golden Rule, Selection Rules Video Lecture | CSIR NET Crash Course for Physical Science - CSIR NET Physical Science
FAQs on Time-dependent Perturbation Theory and Fermi’s Golden Rule, Selection Rules Video Lecture - CSIR NET Crash Course for Physical Science - CSIR NET Physical Science
| 1. What is Time-dependent Perturbation Theory? |  |
Ans. Time-dependent Perturbation Theory is a method used in quantum mechanics to study the behavior of a quantum system when it is subjected to a time-dependent external perturbation. It helps in understanding how the system evolves over time in response to the perturbation.
| 2. How does Time-dependent Perturbation Theory differ from Time-independent Perturbation Theory? | |
Ans. In Time-dependent Perturbation Theory, the external perturbation is a function of time, while in Time-independent Perturbation Theory, the perturbation is a constant. Time-dependent Perturbation Theory is used when the external influence on the system changes with time, allowing for a more detailed analysis of the system's dynamics.
| 3. What is Fermi’s Golden Rule? | |
Ans. Fermi’s Golden Rule is a principle in quantum mechanics that describes the transition rate between quantum states in a system when subjected to a perturbation. It provides a way to calculate the probability of a transition between states and is often used in the study of decay processes.
| 4. How are Selection Rules related to Time-dependent Perturbation Theory and Fermi’s Golden Rule? | |
Ans. Selection Rules are constraints on the transitions allowed between quantum states in a system. They play a crucial role in both Time-dependent Perturbation Theory and Fermi’s Golden Rule by determining which transitions are allowed or forbidden based on certain quantum mechanical principles, such as conservation laws.
| 5. What are some practical applications of Time-dependent Perturbation Theory and Fermi’s Golden Rule? | |
Ans. Time-dependent Perturbation Theory and Fermi’s Golden Rule are used in various areas of physics, such as atomic and molecular physics, solid-state physics, and nuclear physics. They are applied in the study of spectroscopy, quantum optics, and particle physics to understand the behavior of quantum systems under external influences.
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Nov 22, 2024 Last updated |
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