Older wrong versions had (\sin^2(\alpha a)) or (\sin^2(k a)) – that’s the error. If you see sine instead of hyperbolic sine, you have the unfixed version.
In standard editions of Curso de Física Moderna (typically divided into chapters on Relativity, Quanta, Atomic Physics, Nuclear Physics, and Solid State), problem numbers usually reset per chapter. However, based on the numbering scheme common in Latin American editions: Older wrong versions had (\sin^2(\alpha a)) or (\sin^2(k
The “error” in older solucionarios: Forgetting the hyperbolic sine terms or mishandling the complex wave numbers (k1 and k2), leading to a transmission probability greater than 1, or misplacing the factor of 16 in the formula: and Solid State)
Correct formula for T (E < V0): [ T = \left[1 + \frac\sinh^2(\alpha a)4\fracEV_0\left(1 - \fracEV_0\right)\right]^-1 ] Where (\alpha = \sqrt\frac2m(V_0 - E)\hbar^2) and (a) = barrier width. Older wrong versions had (\sin^2(\alpha a)) or (\sin^2(k
The “fixed” solution correctly uses (\sinh^2) instead of (\sin^2) and properly normalizes.
There is a companion: Problemas de Física Moderna by the same authors (Acosta, López, Moreno). Some editions contain fully solved problems. Check: