Q: The radius of the first orbit (n = 1) of a hydrogen atom is 0.529 Å. Then the radius of the second orbit (n = 2) of He+ ion will be
(a)1.058 Å
(b)2.116 Å
(c)4.232 Å
(d)0.529 Å
Correct Answer: (a)
The correct answer is (c) '4.232 Å'. This question from the Science & Technology domain tests knowledge of Space Technology & Astronomy.