General Physics, 2nd Edition
General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
Question
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Chapter 27, Problem 44E

(a)

To determine

Energy emitted due to transition.

(a)

Expert Solution
Check Mark

Answer to Problem 44E

The photon of energy emitted is 1081eV.

Explanation of Solution

Write the expression for energy of diatomic molecule.

    En=n(n+1)22I        (I)

Here, En is the energy of nth level, n is the number of level, is the reduced Planck’s constant and I is the moment of inertia.

Write the expression for change in energy due to transition.

    ΔE=E2E0        (II)

Conclusion:

Substitute 2 for n, 1.055×1034Js for and 1.92×1046kgm2 for I in equation (I).

    E2=2(2+1)(1.055×1034Js)22(1.92×1046kgm2)=2(3)(1.055×1034Js)22(1.92×1046kgm2)(1kgm2s21J)=1.73×1022J(1eV1.6×1019J)=1081eV

 Substitute 0 for n, 1.055×1034Js for and 1.92×1046kgm2 for I in equation (I).

    E0=(0)(0+1)(1.055×1034Js)22(1.92×1046kgm2)=0

Substitute 1081eV for E2 and 0eV for E0 in equation (II)>

    ΔE=1081eV0eV=1081eV

Thus, the energy of photon emitted is 1081eV.

(b)

To determine

The wavelength of photon emitted.

(b)

Expert Solution
Check Mark

Answer to Problem 44E

The wavelength of photon emitted is 11.49nm.

Explanation of Solution

Write the expression for energy of photon emitted.

    E=hcλ

Here, E is the energy of photon, h is Planck’s constant, c is the speed of light and λ is the wavelength.

Rearrange the above expression for λ.

    λ=hcE        (III)

Conclusion:

Substitute 6.626×1034Js for h, 3×108ms1 for c and 1081eV for E in equation (III).

    λ=(6.626×1034Js)(3×108ms1)1081eV=(6.626×1034Js)(3×108ms1)1081eV(1kgm2s21J)(1eV1.6×1019J)=1.149×108m(1nm109m)=11.49nm

Thus, the wavelength of photon emitted is 11.49nm.

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