Calculate the wavelength of the radiation released when an electron moves from n = 4 to n = 2 in a hydrogen atom using the Bohr equation.

Start by understanding the Bohr model, which describes the electron transitions in a hydrogen atom. The energy difference between two levels is given by the formula: $-\frac{R_H}{n^2}$, where $R_H$ is the Rydberg constant (approximately 2.18 x 10^-18 J) and $n$ is the principal quantum number.