In a sample of \( \mathrm{H} \)-atom electrons make transition from \( 5^{\text {th }} \) excite...

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In a sample of \( \mathrm{H} \)-atom electrons make transition from \( 5^{\text {th }} \) excited state upto ground state, producing all possible types of photons, then number of lines in infrared region are:
(a) 4
(b) 5
(c) 6
(d) 3
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