1.

If the radius of the second orbit in hydrogen atom is R then radius of the third orbit is ........

Answer»

3R
2.25 R
9R
`(R )/(3)`

SOLUTION :From EQUATION `r=(n^(2)h^(2)in_(0))/(pimZe^(2)),rpropn^(2)`
`":.r_(1)propn_(1)^(2)impliesr_(2)propn_(2)^(2)`
`:.(r_(2))/(r_(1))=(n_(2)^(2))/(n_(1)^(2))impliesr_(2)=(n_(2)^(2))/(n_(1)^(2)).r_(1)`
`:.r_(2)=(9)/(4)xxR""("":n_(1)=2 and n_(2)=3)`
`:.r_(2)=2.25R`


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