TB_chapter28 - Chapter 28, Atomic Physics CHAPTER 28...

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Chapter 28, Atomic Physics C HAPTER 28 Conceptual Questions C1. Consider the hydrogen atom, singly ionized helium atom, and the doubly ionized lithium atom. Arrange these atoms from highest energy ground state to lowest energy ground state. a. H, He + , Li ++ b. Li ++ , He + , H c. H, Li ++ , He + d. Since each of these atoms has only one electron, they all have the same energy ground state. C2. In the n = 4 shell, how many distinct values of m are possible? a. 4 b. 8 c. 9 d. The correct value is not given. C3. Selenium has atomic number 34. In its ground state, how many electrons are in its n = 2 shell? a. 2 b. 8 c. 10 d. 16 C4. If a hydrogen atom, originally in its ground state of energy –13.6 eV, absorbs a photon of energy 15.0 eV, what is the resulting kinetic energy of the electron if the proton has negligible kinetic energy? a. Such a photon cannot be absorbed in this case. b. –1.4 eV c. 1.4 eV d. 15.0 eV C5. For the n = 4 shell, what are the lowest values possible for and m respectively? a. 0, 0 b. –4, –4 c. 0, –3 d. –3, –3 222
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Chapter 28, Atomic Physics 28.1 Early Models of the Atom 28.2 Atomic Spectra 1. When a wire carries high current causing it to glow, it will emit which type of spectrum? a. line emission b. line absorption c. continuous d. monochromatic 2. When a high voltage is applied to a low-pressure gas causing it to glow, it will emit which type of spectrum? a. line emission b. line absorption c. continuous d. monochromatic 3. When a cool gas is placed between a glowing wire filament source and a diffraction grating, the resultant spectrum from the grating is which one of the following? a. line emission b. line absorption c. continuous d. monochromatic 4. What is the wavelength of the line in the Balmer series of hydrogen that is comprised of transitions from the n = 4 to the n = 2 level? ( R = 1.097 × 10 7 m - 1 and 1 nm = 10 - 9 m) a. 380 nm b. 486 nm c. 523 nm d. 630 nm 5. An alpha particle is: a. a neutral helium atom. b. any positively charged nucleus. c. an x-ray. d. None of the above. 223
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Chapter 28, Atomic Physics 6. According to the Rutherford model of the atom, most of the volume of an atom: a. is empty space. b. was occupied by the nucleus. c. contained positive charges. d. excluded electrons. 7. In contrast to Thomson’s model of the atom, Rutherford’s model: a. had the positive charge spread uniformly through the atom. b. had the positive charge concentrated in a small region. c. was first to explain atoms emitting discrete frequencies. d. eliminated radiation from accelerating charges. 28.3 The Bohr Model 8. The Lyman series of hydrogen is made up of those transitions made from higher levels to n = 1. If the first line in this series has a wavelength of 122 nm, what is the wavelength of the second line? a. 49 nm
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This note was uploaded on 01/06/2012 for the course PHYS 201 taught by Professor Coffin during the Spring '09 term at Oregon State.

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TB_chapter28 - Chapter 28, Atomic Physics CHAPTER 28...

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