The ratio of the radii of the first three orbits in an atom of hydroge

1.	The ratio of the radii of the first three orbits in an atom of hydrogen is
Answer» `1:4:9` `9:4:1` `1:2:3` `3:2:1` SOLUTION :`r_1 :r_2 :r_3 = 1:4:9`

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