Missing parenthesis in one of the expressions
File in which the problem appears
WKB wave function
Problematic sentence
After equation (4) it is stated that:
j(x)=\dfrac{\hbar}{m} A^2 x \dfrac{d\phi}{dx}
Correct version
But the x should be between parenthesis:
j(x)=\dfrac{\hbar}{m} A^2 (x) \dfrac{d\phi}{dx}
The final result is correct = A^2(x)\dfrac{p(x)}{m}