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(C) Characteristic $X$-rays are produced by transitions between inner electron shells (like $K$ or $L$ shells) in atoms with high atomic numbers $(Z)$

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The energy difference between the energy levels of hydrogen is very small.

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(C) Characteristic $X$-rays are produced by transitions between inner electron shells (like $K$ or $L$ shells) in atoms with high atomic numbers $(Z)$.In a hydrogen atom,there is only one electron and the energy difference between its energy levels is very small (in the order of $eV$).$X$-rays require energy transitions in the range of $keV$,which is not possible in a hydrogen atom due to its low atomic number and small energy gap between levels.

Characteristic $X$-rays are not obtained in the spectrum of a hydrogen atom because,

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