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Question

The radius of the second Bohr orbit for hydrogen atom is:
(Planck’s constant h=6.6262×1034Js; mass of an electron =9.1091×1031kg; charge of an electron
e=1.60210×1019C; permittivity of vacuum ϵϕ=8.854185×1012kg1m3A2)

A
4.76A
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B
0.529A
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C
2.12A
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D
1.65A
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Solution

The correct option is C 2.12A
rn=0.53n2ZA

n=2

Z=1

r2=0.53×4A=2.12A

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