1.

When electron in hydrogen is in minimum excited state then its radius will become ...... radius of first orbit.

Answer»

double
half
equal
four times

Solution :four times - For FIRST ORBIT N = 1, RADIUS = `r_(1)`
For first excited state n = 2 radius be `r_(2)`
Now `r_(n)alphan^(2)`
`:.(r_(2))/(r_(1))=((n_(2))/(n_(1)))^(2)`
`=((2)/(1))^(2)"":.(r_(2))/(r_(1))=4`
`:.` Radius will become four times.


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