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Question: The radius of first Bohr orbit in H-atom is r<sub>0</sub>. Then, the radius of the first orbit in si...

The radius of first Bohr orbit in H-atom is r0. Then, the radius of the first orbit in singly ionized helium ion is –

A

r0

B

2r0

C

4r0

D

r0/2

Answer

r0/2

Explanation

Solution

r µ n2Z\frac{n^{2}}{Z} (n = same)

r µ 1/Z Ž rHe+r_{He^{+}}= rH2\frac{r_{H}}{2}