A population inversion for two energy levels is often described by assigning a negative Kelvin temperature to the system. What negative temperature would describe a system in which the population of the upper energy level exceeds that of the lower level by 10% and the energy difference between the two levels is 2.26 eV?

A population inversion for two energy levels is often described by assigning a negative Kelvin temperature to the system. What negative temperature would describe a system in which the population of the upper energy level exceeds that of the lower level by 10% and the energy difference between the two levels is 2.26 eV?

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter28: Atomic Physics

Section: Chapter Questions

Problem 26P

See similar textbooks

Similar questions

For a K*- CH ion pair, attractive and repulsive energies EA and ER, respectively, depend on the distance between the ions r, according to 5.8 x 10-6 1.436 EA and ER For these expressions, energies are expressed in electron volts per K*- CH pair, and r is the distance in nanometers. a) If the net energy EN is just the sum of the two expressions above: EN = E, + ER, Find the values of ro and E, ? b) If curves of E, ER, and EN are plotted in given figure, compare the calculated values of ro and E, with that from the graph. 2 am 0.00 010 0.20 0.30 040 0.70 00 1.00 Interatomic Separation, nm Bonding Energy, eV
The work function of a certain metal is 226.7 kJ / mol. How fast must an He atom (4 amu) collide with the metal to be able to pull an electron from the surface and travel at 1000 m / s? Select one: 8.2619 x 1015m / s None of the above 10647 m / s 337 m / s
Determine the number of energy states per cubic cm in GaAs between Ec and Ec + 0.65 eV at T = 300K. The effective mass of an electron in germanium is 0.067 times its normal mass. N = 4.121 X 1019 states/cm³ N = 3.296 X 1019 states/cm³ N = 2.141 X 1019 states/cm³ ON = 1.924 X 101⁹ states/cm³
Q4. Calculate the values of electron and hole concentrations in cm³ at 300 K for intrinsic Ge, Si and GaAs, given: Quantity me/mo m/mo Eg (eV) mo e kB h Ge 0.55 0.31 0.66 9.1×10-³1 kg 1.6×10-¹9 C 1.38×10-23 J/K 1.054×10-34 Js Si 1.10 0.56 1.12 Ge 0.068 0.500 1.43
a nucleus with 8 protons at x = 5.3 Angstroms on the x-axis. How much work would it take to bring in ANOTHER nucleus with 12 protons from 1 m away and place it at y = 6.1 Angstroms on the y-axis? Question 10 options: -28.3 eV 170.9 eV 57.0 eV 142.6 eV
Now you have a nucleus with 15 protons at x = 7.3 Angstroms on the x-axis. How much work would it take to bring in ANOTHER nucleus with 12 protons from 1 m away and place it at y = 3.0 Angstroms on the y-axis? 189.4 eV 270.5 eV -57.5 eV 328.1 eV
A magnetic field is applied to a freely floating uniform iron sphere with radius R = 2.00 mm. The sphere initially had no net magnetic moment, but the field aligns 12% of the magnetic moments of the atoms (that is, 12% of the magnetic moments of the loosely bound electrons in the sphere, with one such electron per atom). The magnetic moment of those aligned electrons is the sphere’s intrinsic magnetic moment .What is the sphere’s resulting angular speed v?
A neutral sodium atom has an ionization potential of 5.1 eV. What is the speed of a free electron that has just barely enough kinetic energy to collisionally ionize a sodium atom in its ground state? What is the speed of a free proton with just enough kinetic energy to collisionally ionize this atom?
a. The electron of a hydrogen atom is excited into a higher energy level from a lower energy level. A short time later the electron relaxes down to the no = 1 energy level, releasing a photon with a wavelength of 93.83 nm. Compute the quantum number of the energy level the electron relaxes from, nhi. Note: the Rydberg constant in units of wavenumbers is 109,625 cm-1 nhi =16 b. What would the wavenumber, wavelength and energy of the photon be if instead no = 1 and nhi = 4? V: 6.9121e14 x (cm-¹) λ: (nm) E: 45.8e-20 ✓ (1)
(a) If the position of an electron in a membrane is measured to an accuracy of 1.00 m, what is the electron's minimum uncertainty in velocity? (b) If the electron has this velocity, what is its kinetic energy in eV? (c) What are the implications of this energy, comparing it to typical molecular binding energies?
What is the difference in energy between the nx=ny=nz=4 state and the state with the next higher energy? What is the percentage change in the energy between the nx=ny=nz=4 state and the state with the next higher energy? (b) Compare these with the difference in energy and the percentage change in the energy between the nx=ny=nz=400 state and the state with the next higher energy.
A LiBr molecule oscillates with a frequency of 1.701013 Hz. (a) What is the difference in energy in eV between allowed oscillator states? (b) What is the approximate value of n for a state having an energy of 1.0 eV?