Published by:
CGP EDU Academic Team
Published on: August 21, 2026
PHYSICS
The radius of the first permitted Bohr orbit, for the electron, in a hydrogen atom equals 0.51 
and its ground state energy equals -13.6 eV. If the electron in the hydrogen atom is replaced by muon 
[charge same as electron and mass 207 m e ], the first Bohr radius and ground state energy will be __________.
Text Solution
Verified by ExpertsThe correct answer is:
Given that,
r e = 0.51 
= 0.51 x l0 -10 m
As we know according to Bohr's model.
Mass of muon, 
= 207x m e
Now, At equilibrium
Similarly, energy of muon is given as
=-2.8keV
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