1.

The ratio of first three Bohr radii is ………..

Answer»

`1:(1)/(2):(1)/(3)`
`1:2:3`
`1:4:9`
`1:8:27`

SOLUTION :The radius of orbit for atom `=r(n^(2)H^(2)in_(0))/(pimZe^(2))`
`:.ralphan^(2)`
`:.r_(1):r_(2):r_(3)=1^(2):2^(2):3^(2)`
`=1:4:9`


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