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Time-dependent Perturbation Theory and Fermi’s Golden Rule, Selection Rules Video Lecture | CSIR NET Crash Course for Physical Science - CSIR NET Physical Science

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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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