College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 28, Problem 65GP
To determine
The wavelength, frequency and energy of the absorbed photon in the
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A hydrogen atom in its n = 8 state is ionized by absorbing a 294 nm photon. If all the excess energy becomes kinetic energy of the electron, what is the final kinetic energy of the electron? Please give your answer in eV.
A photoelectron is emitted from K shell (n = 1) of a carbon atom, and an election in L shell (n = 2) moves down to the vacancy in K shell. What is the wavelength, in the unit of nm, of the photon emitted during this transition?
Use for the energy difference between two states in an atom.
E0 = 13.6 eV and atomic number of carbon is Z = 12.
Use σ = 1 for the transition to K shell and σ = 7.4 for the transition to L shell
A phosphor material absorbs photons at 460 nm and luminesces at 674 nm. A) Calculate the amount of energy(in eV) dissipated as a heat in each emission process. B) draw schematic energy diagram of the phosphor materials.
Chapter 28 Solutions
College Physics
Ch. 28 - Prob. 1RQCh. 28 - Prob. 2RQCh. 28 - Prob. 3RQCh. 28 - Prob. 4RQCh. 28 - Prob. 5RQCh. 28 - Prob. 6RQCh. 28 - Prob. 7RQCh. 28 - Prob. 8RQCh. 28 - Prob. 1MCQCh. 28 - Prob. 2MCQ
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- The ion Li2+ makes ail atomic transition from ail n = 4 state to ail n = 2 state, (a) What is the energy of the photon emitted during the transition? (b) What is the wavelength of the photon?arrow_forwardDerive an expression for the ratio of X-ray photon frequency for two elements with atomic numbers Z1 and Z2.arrow_forwardWhat are the possible values of m for an electron in the n = 4 state?arrow_forward
- Measurements indicate that an atom remains in an excited state for an average time of 50.0 ns before making a transition to the ground state with the simultaneous emission of a 2.1-eV photon. (a) Estimate the uncertainty in the frequency of the photon. (b) What fraction of the photon's average frequency is this?arrow_forwardA visible (violet) emission spectral line for chromium (Cr) occurs at wavelength λ = 425.435 nm. A) What is the frequency (ν) of this light?(Give correct units and answer to six significant figures.) B) What is the magnitude of the energy change associated with the emission of one mole of photons of light with this wavelength?arrow_forwardX-ray is produced by bombarding a tungsten target with high energy electrons accelerated by 8.8 kV of voltage. Use σ = 1 for the electron transition down to K shell (n = 1) and σ = 7.4 for the electron transition down to L shell (n = 2) for characteristic X-ray. What is the kinetic energy of electrons accelerated by 8.8 kV of high voltage? Assume that the initial speed of electrons emitted from a filament by thermionic emission is zero. What is the minimum wavelength of electromagnetic waves produced by bremsstrahlung?arrow_forward
- The allowed energies of a simple atom are 0.00 eV, 4.23 eV, 6.57 eV. What wavelengths appear in the atom’s emission spectrum and in the atom’s absorption spectrum?arrow_forwardRuby lasers have chromium atoms doped in an aluminum oxide crystal. The energy level diagram for chromium in a ruby is shown in the figure above. (a)Calculate the energy of photons that can pump chromium atoms in a ruby laser from the ground state to its second excited state. eV (b)Calculate the energy of photons that can pump chromium atoms in a ruby laser from the ground state to its third excited state. eV (c)Calculate the wavelength emitted by the ruby laser (in nm). nmarrow_forwardThe K series of the discrete spectrum of tungsten contains wavelengths of 0.018 5 nm, 0.020 9 nm, and 0.021 5 nm. The K-shell ionization energy is 69.5 keV. Determine the ionization energies of the L, M, and N shells.arrow_forward
- A Bohr-like atom has a ground state energy (n=1) of -41.4eV. An electron makes a transition from the n=4 state to the n=2 state. The emitted photon is then incident onto a metal surface with a work function equal to 3.34eV. What is the wavelength (nm) of the emitted photon?HINT: Bohr-like atom means that the energy, En, of the n-th level scales as En=E1/n^2, where E1 is the ground state energy.arrow_forwardThe L series of the characteristic x-ray spectrum of tungsten contains wavelengths of 0.1099 nm and 0.1282 nm. The L-shell ionization energy is 11.544 keV. Which x-ray wavelength corresponds to an N → L transition? Determine the ionization energies of the M and N shells: If the incident electrons were accelerated through a 40.00 keV potential difference before striking the target, find the shortest wavelength of the emitted radiation:arrow_forwardA photon is emitted when an electron in a three- dimensional cubical box of side length 8.00 * 10-11 m makes a transition from the nX = 2, nY = 2, nZ = 1 state to the nX = 1, nY = 1, nZ = 1 state. What is the wavelength of this photon?arrow_forward
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