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(C) The hydrogen atomic spectrum consists of five series of spectral lines, which fall into specific regions of the electromagnetic spectrum: $1$. Lym

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$(i)$, $(iii)$

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(C) The hydrogen atomic spectrum consists of five series of spectral lines, which fall into specific regions of the electromagnetic spectrum: $1$. Lyman series: $UV$ region $2$. Balmer series: Visible region $3$. Paschen series: $IR$ region $4$. Brackett series: $IR$ region $5$. Pfund series: $IR$ region Comparing these with the given options: $(i)$ $\gamma$-radiation: Not observed. $(ii)$ $UV$: Observed (Lyman series). $(iii)$ $X$-rays: Not observed. $(iv)$ Infrared: Observed (Paschen, Brackett, Pfund series). Therefore, $\gamma$-radiation and $X$-rays are not seen in the hydrogen atomic spectrum.

Which of the following sets of radiations cannot be seen in the hydrogen atomic spectrum? $(i)$ $\gamma$-radiation $(ii)$ $UV$ $(iii)$ $X$-rays $(iv)$ Infrared

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