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A mixture of hydrogen atoms (in their gr...

A mixture of hydrogen atoms (in their ground state) and hydrogen like ions (in their first excited state) are being excited by electrons which have been accelerated by same potential of emitted light are found in the ratio 5:1. Then, find
(a) the minimum value of V for which both the atoms get excited after collision with electrons.
(b) atomic number of other ion.
(c ) the energy of emitted light.

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