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Show that the speed of electron in the s...

Show that the speed of electron in the second orbit of `He^(+)` atom is equal to the speed of electron in the first orbit of hydrogen atom.

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We have , `v_n=(1)/(4piin_0)(Ze^2)/(nh)`
`therefore (v_1)/(v_2)=(Z_1)/(Z_2)*(n_2)/(n_1)=2/1xx1/2=1 or, v_1=v_2`
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