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Quantum Mechanics
Define the following: (i) Thermionic emission, (ii) Photoelectric emission, (iii) Stopping potential
Quantum Mechanics
(a) Distinguish between emission and absorption spectra
(b) Excitation and ionization energy
(b) Excitation and ionization energy
Quantum Mechanics
(a) Distinguish between emission and absorption spectra
(b) Excitation and ionization energy .
(c) Define the following: (i) Thermionic emission, (ii) Photoelectric emission, (iii) Stopping potential
(b) Excitation and ionization energy .
(c) Define the following: (i) Thermionic emission, (ii) Photoelectric emission, (iii) Stopping potential
Quantum Mechanics
The energy levels of an atom are given as follows: —2.8 eV, —6.5 eV, —8.6 eV, —13.6 eV.
1. Why are the values negative?
2. What is the ionization energy of the atom?
3 find the wavelength of the photon emitted when the atom falls from —6.5 eV to the -13.6 eV
1. Why are the values negative?
2. What is the ionization energy of the atom?
3 find the wavelength of the photon emitted when the atom falls from —6.5 eV to the -13.6 eV
Quantum Mechanics
Gold has a work function of 4.9 eV. (a) Calculate the maximum kinetic energy, in joules, of the electrons emitted when gold is illuminated with ultraviolet radiation of frequency 1.7 x 10^15 Hz. (b) What is the energy expressed in eV?
(c) What is the stopping potential for these electrons? (e = - 1.6 x 10^19 - 6.6 x 10^34Js)
(c) What is the stopping potential for these electrons? (e = - 1.6 x 10^19 - 6.6 x 10^34Js)
Quantum Mechanics
Calcium has a work function of 2.7 eV. (a) What is the function of calcium expressed in joules? (b) What is the threshold frequency for calcium? (c) What is the maximum wavelength that will cause emission from calcium?
(e = 1.6 x 10-19 c,h - 6.6 x 10-34 Js,c = 3.0 x 108 ms-l.)
(e = 1.6 x 10-19 c,h - 6.6 x 10-34 Js,c = 3.0 x 108 ms-l.)
Quantum Mechanics
Calcium has a work function of 2.7 eV
(a) What is the function of calcium expressed in joules? (b) What is the threshold frequency for calcium? (c) What is the maximum wavelength that will cause emission from calcium? (e=1.6×10^-19 C, ℎ=6.6×10^-34 Js , c=3.0×10^8 m/s) .
(a) What is the function of calcium expressed in joules? (b) What is the threshold frequency for calcium? (c) What is the maximum wavelength that will cause emission from calcium? (e=1.6×10^-19 C, ℎ=6.6×10^-34 Js , c=3.0×10^8 m/s) .
Quantum Mechanics
Calculate the energy of (a) a photon of frequency 7.0×10^14 Hz , (b) a photon of wavelength 3.0×10^-.7 m.
Quantum Mechanics
Write canonical transformation in poission bracket
Quantum Mechanics
Write down expectation value of r for hydrogen atom.
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