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What is the ratio of radius of the 1^st ...

What is the ratio of radius of the `1^st` orbit to `2^nd` orbit, if the velocity of the electron in the `1^st` orbit is twice that of the `2^nd` orbit.

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(i) comparing the angular momentum of electron in the orbits
composition of radius
(iii) `r_1:r_2=1:4`
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