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The radius of the second Bohr orbit for hydrogen atom is : <br> (Planck's constant $h= 6.6262 \times 10^{-34} Js$; mass of electron = $9.1091 \times 10^{-31} kg$; charge of electron $e = 1.60210 \times 10^{-19}C$; permittivity of vacuum $\in_0 = 8.854185 \times 10^{-12} kg^{-1}m^{-3}A^{2}$)


( A ) $4.76 \mathring{A}$
( B ) $1.65 \mathring{A}$
( C ) $0.529 \mathring{A}$
( D ) $2.12 \mathring{A}$

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