Which of the following persons used the ideas of quantum mechanics to describe why the spectral classification scheme is in order of decreasing temperature?

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Cecilia Payne-Gaposchkin used the ideas of quantum mechanics to explain why hotter stars have ionized elements in their spectra while cooler stars have more neutral elements. This led to the development of the spectral classification scheme, which orders stars by temperature. Annie Jump Cannon, Williamina Fleming, Henry Draper, and Edward Pickering all made significant contributions to the classification of stars based on their spectra, but did not directly apply quantum mechanics to this problem.

Which of the Following Persons Used the Ideas of Quantum