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In a mixture of $$H - He^+$$ gas ($$He^+$$ is singly ionized He atom), H atoms and $$He^+$$ ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to $$He^+$$ ions (by collisions). Assume that the Bohr model of atomis exactly valid.
Question 42
The wave length of light emitted in the visible region by $$He^+$$ ions after collisions with H atoms is
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