121reviewmidterm2

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1. (5 pts) Citizen’s band (CB) radio operates at a wavelength of 27.3 MHz (27.3 x 10 6 s -1 ). What is the frequency of radio waves in m? (c= 2.998 x 10 8 ms -1 ) a) 0.819 b) 5.09 c) 11.0 d) 16.7 e) 24.4 2. (5 pts) Which of the following postulates of Bohr’s Theory of the Hydrogen Atom does not apply when many-electron atoms are considered? a) The electron is restricted to certain energy levels. b) Electrons move in spherical orbits about the nucleus. c) The principal quantum number can have integer values starting with n = 1. d) Increasing values of n correspond to increasing the average distance from the nucleus. e) The n = 1 level has the lowest energy. 3. (7 pts) Which of the listed transitions of an electron in the hydrogen atom would emit a photon with the longest wavelength? a) n = 2 to n = 5 b) n = 3 to n = 4 c) n = 4 to n = 1 d) n = 1 to n = 2 e) n = 5 to n = 4 1
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4. (7 pts) Calculate the change in energy in joules (J) when an electron makes a transition from the n = 3 to the n = 1 energy level in the hydrogen atom. a) – 2.420 x 10 -15 b) – 9.751 x 10 -16 c) - 6.284 x 10 -17 d) – 1.938 x 10 -18 e) - 4.576 x 10 -19 5. (5 pts) Which one of the following statements concerning the f-subshell in a many- electron atom is incorrect? a) It can accommodate 18 electrons. b) It will have an orbital with m l = 0. c) It has 7 orbitals. d) It must have a principal quantum number greater than or equal to n = 4.
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121reviewmidterm2 - <?xml version="1.0"...

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