Answer:
c. emission of electromagnetic radiation.
Explanation:
When an atom changes its state from an excited one to the ground state, it means that the atom is changing from a state with higher energy to a state of lower energy.
This can occur, for instance, in the presence of an electronic transition (an electron moving from a higher energy level to a lower energy state) or of a nuclear transition (the nucleus get de-excited). In both cases, since the total energy must be conserved, there must be energy released. This energy is released as a photon (electromagnetic radiation), whose energy is equal to the difference between the two energy levels involved in the transition.
The change of an atom from an excited state to the ground state always requires emission of stored form of electromagnetic radiation. Hence, option (C) is correct.
The excitation of atom is explained as follows:
In this way, excitation and de-excitation of atom from one energy level to another and from higher energy level to ground state takes place, which involves the absorption and release of electromagnetic radiation.
Thus, we can conclude that the change of an atom from an excited state to the ground state always requires emission of electromagnetic radiation. Hence, option (C) is correct.
Learn more about atomic excitation here:
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