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If in Bohr's model, for unielectronic at...

If in Bohr's model, for unielectronic atom, time period of revolution is represented as `T_(n,z)` where `n` represents shell no. and `Z` represents atomic number then the value of `T_(1,2):T_(2,1)` , will be `:`

A

`8:1`

B

`1:8`

C

`1:1`

D

`1:32`

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