Question

What is the order of the radius of an electron orbit in a hydrogen atom?

(a) 10^-8 m

(b) 10^-9 m

(c) 10^-11 m

(d) 10^-13 m

This question was addressed to me in an international level competition.

Query is from Bohr Model of the Hydrogen Atom topic in section Atoms of Physics – Class 12

Answer 1

The correct choice is (c) 10^-11 m

To explain: The radius of an electron orbit in a hydrogen atom is of the order of 10^-11 m. It is equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state.