Concept explainers
(a)
The expression for the energy level of the sole remaining electron.
(a)

Answer to Problem 28P
The expression for the energy level of the sole remaining electron is En=−(122 eV)n2.
Explanation of Solution
Formula to calculate the energy level is,
En=−Z2(13.6 eV)n2
- En is the nth energy level,
- n is nth level
- Z is the atomic number
Substitute 3 for Z to find En.
En=−(3)2(13.6 eV)n2=−(122 eV)n2
Thus, expression for the energy level is −(122 eV)n2.
Conclusion:
Therefore, the expression for the energy level is −(122 eV)n2.
(b)
The energy for the level n=4.
(b)

Answer to Problem 28P
The energy for the level n=4 is −7.63 eV.
Explanation of Solution
Formula to calculate the energy level is,
En=−(122 eV)n2
- En is the nth energy level,
- n is nth level
Substitute 4 for n to find En.
E4=−(122 eV)(4)2=−7.63 eV
Thus, the energy for the level n=4 is −7.63 eV.
Conclusion:
Therefore, the energy for the level n=4 is −7.63 eV.
(c)
The energy for the level n=2.
(c)

Answer to Problem 28P
The energy for the level n=2 is −30.5 eV.
Explanation of Solution
Formula to calculate the energy level is,
En=−(122 eV)n2
- En is the nth energy level,
- n is nth level
Substitute 2 for n to find En.
E2=−(122 eV)(2)2=−30.5 eV
Thus, the energy for the level n=2 is −30.5 eV.
Conclusion:
Therefore, the energy for the level n=2 is −30.5 eV.
(d)
The energy of the photon for the transition from fourth level to second level.
(d)

Answer to Problem 28P
the energy of the photon for the transition from fourth level to second level is 22.9 eV or 3.66×10−18 J.
Explanation of Solution
Formula to calculate the energy difference is,
Ephoton=(E4−E2)
- E2 and E4 are the second and fourth level energy,
- En is nth level energy
From unit conversion,
1 eV=1.6×10−19J
Substitute (−7.63 eV) for E4, (−30.5 eV) for E2 to find Ephoton.
Ephoton=[(−7.63 eV)−(−30.5 eV)]=22.9 eV=22.9 eV×1.6×10−19J1 eV=3.66×10−18 J
Thus, the energy of the photon for the transition from fourth level to second level is 22.9 eV or
3.66×10−18 J.
Conclusion:
Therefore, the energy of the photon for the transition from fourth level to second level is 22.9 eV or 3.66×10−18 J.
(e)
The frequency and wavelength of the emitted photon.
(e)

Answer to Problem 28P
The frequency and wavelength of the emitted photon is 5.52×1015 Hz and 5.43×10−8m respectively.
Explanation of Solution
Formula to calculate the frequency of the photon is,
f=Ephotonh
- Ephoton is the photon energy
- h is Planck’s constant
Substitute 3.66×10−18J for Ephoton, 6.63×10−34 J-s for h to find f.
f=(3.66×10−18 J)(6.63×10−34 J-s)=5.52×1015 Hz
Formula to calculate the wavelength of the photon is,
λ=cf
- c is the speed of light
- f is the frequency
Substitute 3×108m/s for c, 5.52×1015 Hz for f to find λ.
λ=3×108 m/s5.52×1015 Hz=5.43×10−8m
Thus, the frequency and wavelength of the emitted photon is 5.52×1015 Hz and 5.43×10−8m respectively.
Conclusion:
Therefore, the frequency and wavelength of the emitted photon is 5.52×1015 Hz and 5.43×10−8m respectively.
(f)
The wavelength belongs to in which spectrum.
(f)

Answer to Problem 28P
The wavelength belongs to in which spectrum is deep ultraviolet region.
Explanation of Solution
The wavelength of the photon for the transition is 5.43×10−8m. So, this wavelength belongs to deep ultraviolet region.
Thus, this wavelength belongs to deep ultraviolet region.
Conclusion:
Therefore, the wavelength belongs to deep ultraviolet region
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Chapter 28 Solutions
College Physics, Volume 1
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