Doubly ionized oxygen atoms (O^(2-)) and...

Doubly ionized oxygen atoms `(O^(2-))` and singly-ionized lithium atoms `(Li^(+))` are travelling with the same speed, perpendicular to a uniform magnetic field. The relative atomic masses of oxygen and lithium are 16 and 7 respectively. The ratio `("radius of " O^(2-) "orbit")/("radius of "Li^(+) " orbit")` is

`16 : 7`

`8 : 7`

`7 : 8`

`7 : 16`

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