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# In Bohr’S Model of the Hydrogen Atom, the Radius of the First Orbit of an Electron is R0 . Then, the Radius of the Third Orbit Is: - ISC (Science) Class 12 - Physics (Theory)

ConceptBohr'S Model for Hydrogen Atom

#### Question

In Bohr’s model of the hydrogen atom, the radius of the first orbit of an electron is r0 . Then, the radius of the third orbit is:

a) r_0/9

b) r_0

c) 3r_0

d) 9r_0

#### Solution

9r_0

∵ r_n = n^2(r_0)

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Solution In Bohr’S Model of the Hydrogen Atom, the Radius of the First Orbit of an Electron is R0 . Then, the Radius of the Third Orbit Is: Concept: Bohr'S Model for Hydrogen Atom.
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