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प्रश्न
In Bohr’s model of the hydrogen atom, the radius of the first orbit of an electron is r0 . Then, the radius of the third orbit is:
a) `r_0/9`
b) `r_0`
c) `3r_0`
d) `9r_0`
उत्तर
`9r_0`
`∵ r_n = n^2(r_0)`
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