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

Options

A. double
B. half
C. equal
D. four times

Answer

D

Explanation

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.