Some of the energy levels of a mercury atom are shown in the figure above. (i) Calculate the ionization energy of a mercury atom in electronvolts (eV) and in joules (J). (ii) Calculate the wavelength of radiation emitted when an electron moves from level 4 to level 2. In of electromagnetic spectrum does this wavelength lie? (iii) State what is likely to happen if a mercury atom in the unexcited state (level 1) is bombarded w.
Some of the energy levels of a mercury atom are shown in the figure above. (i) Calculate the ionization energy of a mercury atom in electronvolts (eV) and in joules (J). (ii) Calculate the wavelength of radiation emitted when an electron moves from level 4 to level 2. In of electromagnetic spectrum does this wavelength lie? (iii) State what is likely to happen if a mercury atom in the unexcited state (level 1) is bombarded w.
Chemistry
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Question 4(i), (ii) and (iii)
Transcribed Image Text:QUESTIONS ON QUANTUM PHYSICS
1. Calculate the energy of (a) a photon of frequency 7.0 × 1014 Hz, (b) a photon of wavelength 3.0 x 10-7 m.
2. 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?
1.6 x 10-19 C, h = 6.6 × 10-34 Js,c = 3.0 x 108 ms-1.)
(e
3. 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 1015 Hz. (b) What is the energy
1.6 x 10-19 C, h = 6.6 × 10-34 Js)
expressed in eV? (c) What is the stopping potential for these electrons? (e
4.
level
energy in eV
4
-1.6
3.
-3.7
-5.5
1
-10.4
Some of the energy levels of a mercury atom are shown in the figure above.
(i) Calculate the ionization energy of a mercury atom in electronvolts (eV) and in joules (J).
(ii) Calculate the wavelength of radiation emitted when an electron moves from level 4 to level 2. In what part
of electromagnetic spectrum does this wavelength lie?
(iii) State what is likely to happen if a mercury atom in the unexcited state (level 1) is bombarded with electrons
with energies 4.0 eV,6.7 eV, and 11.0 eV respectively.
5. 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 fine the wavelength of the phone emitted when the atom falls from -6.5 eV too the - 13.6 eV.
6. (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
1
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