Question

Radius of first orbit of hydrogen atom is 0. 53. so the radius of second orbit is

Answer 1

N square = N2
N2 × 0.53
(2)2 × 0.53
4 × 0.53
= 2.12

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Answer 2

radius of first orbit of hydrogen is 0.529 angstrom.....
radius of successive orbits of hydrogen will be n^2×0.529 angstrom

where n= orbit number

now u r asking about 2nd orbit
therefore
radius of 2nd orbit of H=(2)^2×0.529A
=2.116A