Comment on the paper "The finite square well: whatever is worth teaching at all is worth teaching well ", arXiv:1505.03376v2 [physics.ed-ph] by K. Razi Naqvi and S. Waldenstr{\o}m

TL;DR

This paper defends the validity of Garrett's method for approximating bound state energies in finite wells, clarifying misconceptions and showing its equivalence to Barker's approximation, thus reaffirming its correctness.

Contribution

It clarifies the correct application of Garrett's method and demonstrates its equivalence to Barker's approximation, countering previous claims of inaccuracies.

Findings

Garrett's method is valid for finite well bound state calculations.

Garrett's method is equivalent to Barker's approximation.

Previous claims of incorrectness are refuted.

Abstract

In the aforementioned paper, the authors claim that my results concerning the consequent application of Garrett's method for obtaining approximate expressions of the bound states energy of a particle in a finite rectangular well are incorrect. I shall show hat this is not the case, and demonstrate that both their and my results lead to the same conclusion, i.e. that the consequent application of Garrett's method is equivalent to Barker's approximation.