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(D) $X$-rays are high-energy electromagnetic radiations produced by transitions between inner electron shells (like $K$-shell to $L$-shell) in atoms w

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energy levels in it are very close to each other

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(D) $X$-rays are high-energy electromagnetic radiations produced by transitions between inner electron shells (like $K$-shell to $L$-shell) 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 $eV$).$X$-ray emission requires energy transitions in the order of $keV$.Therefore,a hydrogen atom cannot emit $X$-rays because the energy levels are too close to each other to produce such high-energy photons.

$A$ hydrogen atom does not emit $X$-rays because

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