1.

In Bohr's model, the atomic radius of the first orbit is r_(0). Then, the radius of third orbit is

Answer»

`r_(0)/9`
`r_(0)`
`9r_(0)`
`3r_(0)`

Solution :`r_(N) = r_(1)n^(2)`, where `r_(1) = r_(0)`
`therefore v_(3) = r_(0)(3)^(2) = 9r_(0)`


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