General Physics, 2nd Edition
General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Chapter 27, Problem 39E

(a)

To determine

The energy of lowest level of muonic atom.

(a)

Expert Solution
Check Mark

Answer to Problem 39E

The energy of lowest energy level is 7.8×105eV.

Explanation of Solution

Write the expression for energy of atom.

    E=mμZ2e4322π2ε021n2        (I)

Here, E is the ground state energy, mμ is the mass of muon, Z is the atomic number, e is the electronic charge, is reduced Planck’s constant, ε0 is the permittivity and n is the number of orbital.

 Conclusion:

Substitute 207(9.1×1031kg) for mμ, 1 for Z, 1.6×1019C for e, 1.055×1034Js for , 8.85×1012C/m for ε0 and 1 for n in equation (I).

    E=207(9.1×1031kg)(16)2(1.6×1019C)432(1.055×1034)2(3.14)2(8.85×1012F/m)21(1)2=207(9.1×1031kg)(16)2(1.6×1019C)432(1.055×1034)2(3.14)2(8.85×1012F/m)21(1)2(1F1C/V)2(1J1kgm2s2)(1J1CV)2=114.9×1015J(1eV1.6×1019J)=7.18×105eV 

Thus, the energy of lowest energy level is 7.8×105eV.

(b)

To determine

The radius of lowest energy orbit.

(b)

Expert Solution
Check Mark

Answer to Problem 39E

The radius of lowest orbit is 1.6×1014m.

Explanation of Solution

Write the expression for radius.

    rn=n22kZmμe2        (II)

Here, rn is the radius of orbit, n is the number of orbit, is the reduced Planck’s constant, k is force constant, mμ is mass of muon, e is electronic charge and Z is the atomic number.

Conclusion:

Substitute 1 for n, 1.055×1034Js for , 9×109F/m for k, 16 for Z, 207(9.1×1031kg) for mμ and 1.6×1019C for e in equation (II).

    r1=(1)2(1.055×1034Js)2(9×109F/m)(16)(207)(9.1×1031kg)(1.6×1019C)2=(1)2(1.055×1034Js)2(9×109F/m)(16)(207)(9.1×1031kg)(1.6×1019C)2(1kgm2s21J)(1F1C/V)(1C/V1J)=1.6×1014m

Thus, the radius of lowest orbit is 1.6×1014m.

(c)

To determine

The ratio of orbital radius to that of sulfur.

(c)

Expert Solution
Check Mark

Answer to Problem 39E

The ratio of orbital radius to that of sulfur is 4.

Explanation of Solution

Write the expression for ratio.

    r=rors        (III)

Here, r is the ratio of radius, ro is the radius of orbit and rs is the radius of sulfur.

Conclusion:

Substitute 1.6×1014m for ro and 4×1015m for rs in equation (III).

    r=1.6×1014m4×1015m=4

Thus, the ratio of orbital radius to that of sulfur is 4.

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