This detailed answer explains how to calculate the frequency of absorbed photons, electron energy at specific levels, and possible emission frequencies in hydrogen atoms.
A) The frequency of the absorbed photon can be calculated using the formula E = hf, where E is the energy difference between the initial and final states, h is the Planck constant, and f is the frequency of the photon.
B) The energy of the electron at the third energy level (n=3) can be calculated using the formula E = -13.6/n^2 eV, where n=3.
C) For the electron to come back to its ground state, it can emit photons with frequencies corresponding to the energy differences between the higher energy levels and the ground state.
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