Using Bohr's postulates of the atomic model, derive the expression for radius of nth electron orbit. Hence obtain the expression for Bohr's radius.
Centripetal force is provided by the electrostatic force of attraction.
mv2r=e24πεor2
From bohr's second postulate.
Ln=mvnrn=nh2π
Eliminating vn from above equations.
rn=n2h2εoπme2
Bohr's radius is the radius of the innermost orbit. Hence, n=1
r1=h2εoπme2