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     EduGorilla 
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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 atom is exactly valid.

    The wavelength of the light emitted in the visible region by He+ ions after collisions with H atoms is

    Options :-

    1. 6.5  10-7 m
    2. 5.6  10-7 m
    3. 4.8  10-7 m
    4. 4.0  10-7 m
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