1.

According to Bohr's model of atom the orbit of an electron ...... [Where n is quantum number and Z = atomic number].

Answer»

`r_(n)PROP(n)/(Z)`
`r_(n)prop(n^(2))/(Z)`
`r_(n)prop(n^(2))/(Z^(2))`
`r_(n)prop(Z^(2))/(n^(2))`

Solution :`r_(n)prop(n^(2))/(Z)`
`r_(n)=(n^(2)H^(2)in_(0))/(piZe^(2)m)`, here `(h^(2)in_(0))/(PIE^(2)m)` =constant


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