Final answer:
An electron transition from n = 2 to n = 5 in a Bohr hydrogen atom corresponds to an energy of 4.9 x 10^-19 J. Therefore, the correct answer is E. 4.9 x 10^-19 J.
Step-by-step explanation:
In the Bohr model of the hydrogen atom, electron transitions between energy levels are accompanied by the emission or absorption of photons. The energy of these photons is given by the equation:
E = -((13.6 eV)/(n^2)) * (1/n_f^2 - 1/n_i^2)
Where E is the energy of the photon, n_f is the final energy level, and n_i is the initial energy level. For the given transition from n = 2 to n = 5, the energy of the photon is:
E = -((13.6 eV)/(5^2)) * (1/5^2 - 1/2^2) = 4.9 x 10^-19 J
Therefore, the correct answer is E. 4.9 x 10^-19 J.