12.17 Obtain the first Bohr’s radius and the ground state energy of a muonic hydrogen atom [i.e., an atom in which a negatively charged muon (μ–) of mass about 207me orbits around a proton].

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    Vishal Baghel | Contributor-Level 10

    6 months ago

    12.17 Mass of a negatively charged muon, m ? = 207 m e

    According to Bohr's model

    Bohr radius, r e ? 1 m e

    And, energy of a ground state electronic hydrogen atom E e ? m e

    Also, the energy of a ground state muonic hydrogen atom, E u ? m u

    We have the value of the first Bohr orbit, r e = 0.53 Å = 0.53 * 10 - 10 m

    Let r o be the radius of muonic hydrogen atom

    At equilibrium, we can write the relation as:

    m e r ? = m e r e

    207 m e r ? = m e r e

    r ? = r e 207 = 0.53 * 10 - 10 207 =2.56 * 10 - 13 m

    Hence, the value of the first Bohr radius of a muonic hydrogen atom is 2.56 * 10 - 13 m

    We have E e = -13.6 eV

    Take the ratio of these energies as:

    E e E ? = m e m ? = m e 207 m e

    E ? = 207 E e = 207 * - 13.6 e V = -2.81 keV

    Hence, the ground state energy of a muonic hydrogen atom is -2.81 keV.

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