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Question

The radius of the second Bohr orbit for hydrogen atom is:
(Plank’s const. H = 6.6262 x1034Js; mass of electron = 9.1091 x 1031kg; charge of electron e = 1.60210 x 1019C; permittivity of vaccum ϵ0=8.854185×1012kg1m3A2)


A
1.65Å
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B
4.76Å
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C
0.529Å
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D
212Å
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Solution

The correct option is D 212Å

Radius of nth Bohr orbit in H-atom = 0.53 n2Å

Radius of II Bohr orbit = 0.53 ×(2)2

= 2.12 Å


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