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Wrichik Basu

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## Main Question or Discussion Point

In order to use WKB approximation, the potential has to be "slowly varying". I learnt the method from this video:

But the Professor hasn't mentioned in detail what the measure of "slowly varying" is.

What is the limit beyond which we cannot use the WKB method accurately?

#### Advanced Quantum Mechanics with Applications by Prof. Saurabh Basu (NPTEL):- WKB Approximation, Bohr Sommerfeld quantization condition

Copyright strictly reserved to Prof. Saurabh Basu and NPTEL, Govt. Of India. Duplication...

But the Professor hasn't mentioned in detail what the measure of "slowly varying" is.

What is the limit beyond which we cannot use the WKB method accurately?