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Show that the Ratio of the Magnetic Dipole Moment to the Angular Momentum (L = Mvr) is a Universal Constant for Hydrogen-like Atoms and Ions. Find Its Value. - Physics


Show that the ratio of the magnetic dipole moment to the angular momentum (l = mvr) is a universal constant for hydrogen-like atoms and ions. Find its value. 

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Mass of the electron, m = 9.1×10-31kg

Radius of the ground state, r = 0.53×10 -10 m

Let  f be the frequency of  revolution of the electron moving in the ground state and A be the area of orbit.

Dipole moment of the hydrogen like elements (μ) is given by

μ = niA = qfA

`= e xx m/(4∈_0^2 h^3n^3 )xx(pir_0^2n^2)`

`= (me^5xx(pir_0^2n^2))/(4∈_0^2h^3n^3)`


h = Planck's constant

=  Charge on the electron

ε0 = Permittivity of free space

n = Principal quantum number  

Angular momentum of the electron in the hydrogen like atoms and ions (L) is given by

`L = mvr = (nh)/(2pi)`
Ratio of the dipole moment and the angular momentum is given by

`mu/L =( e^5xxmxxpir^2n^2)/(4∈_0h^3n^3)xx (2pi)/(nh)`

`mu/L =((1.6xx10^-19)^5xx(9.10xx10^-31)(3.14)^2xx(0.53xx10xx^-10)^2)/(2(8.85xx10^-12)^2xx(6.63xx10^-34)^3xx1^2`

`mu/L = 3.73 xx 10^10 C // kg`

Ratio of the magnetic dipole moment and the angular momentum do not depends on the atomic number 'Z'.

Hence, it is a universal constant.

Concept: The Line Spectra of the Hydrogen Atom
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 21 Bohr’s Model and Physics of Atom
Q 26 | Page 385
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