In a mixture of \( \mathrm{H}-\mathrm{He}^{+} \)gas \( \left(\mathrm{He}^{+}\right. \)is singly ionized He atom), H-atoms and \( \mathrm{He}^{+} \)ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to \( \mathrm{He}^{+} \) ions (by collisions).
The wavelength of light emitted in the visible region by \( \mathrm{He}^{+} \)ions after collisions with \( \mathrm{H} \)-atoms is
(a) \( 6.5 \times 10^{-7} \mathrm{~m} \)
(b)
\( -5.6 \times 10^{-7} \mathrm{~m} \)
(c) \( 4.8 \times 10^{-7} \mathrm{~m} \)
(d) \( 4.0 \times 10^{-7} \mathrm{~m} \)
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