A quantum release of energy as electrons drop back to their ground state causes the lines in the emission spectrum for elements. Hence, Option (C) is correct.
What is Emission Spectrum ?
The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a transition from a high energy state to a lower energy state.
The photon energy of the emitted photon is equal to the energy difference between the two states.
A quantum release of energy as electrons drop back to their ground state causes the lines in the emission spectrum for elements. Hence, Option (C) is correct.
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