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The circumference of second orbit of hyd...

The circumference of second orbit of hydrogen atom, if the wavelength of electron is `5 xx 10^(-9)m` will be

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Circumference `= 2pi r`
But `r = n^(2) xx 0.529 A^(0) = 2^(2) xx 0.529 A^(0) = 2.116 A^(0)`
Circumference `= 2 xx 3.14 xx 2.116 A^(0) = 13.3 A^(0)`
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