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Q.

The ratio for the speed of the electron in the 3rd orbit of He+  to the speed of the electron  in the 3rd orbit of hydrogen atom will be :-

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a

2 : 1

b

1 : 2

c

1 : 1

d

4 : 1

answer is D.

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Detailed Solution

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v ∝ Zn ∝ Z  n = constant

⇒vHe+vH = ZHe+ZH = 21

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The ratio for the speed of the electron in the 3rd orbit of He+  to the speed of the electron  in the 3rd orbit of hydrogen atom will be :-