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Physics 30: Assignment 17<The Rutherford and Bohr Models of the Atom>

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ASSIGNMENT 17 The Rutherford and Bohr Models of the Atom This assignment is worth 27 marks. The value of each question is noted in the left margin in parenthesis. Note: The answer areas will expand to fit the length of your response. 1. According to Maxwell's Laws of electromagnetism, the orbital frequency (the number of complete orbits per second) of an electron will match the frequency of the emitted radiation. (1) a. If an electron spirals into the nucleus, what would happen to the electron’s orbital frequency? (1) b. If an electron spirals into the nucleus, what would happen to the frequency of the emitted radiation? (2) c. If an electron spirals into the nucleus, what kind of spectrum would be produced – a continuous spectrum or a line spectrum? Explain. 2. (1) Review the emission spectrum of hydrogen below and answer the two questions that follow. a. What kind of spectrum is this? (1) b. Does Rutherford’s model predict the correct spectrum? (1) 3. According to Bohr, why did an atom not collapse in on itself while its electrons traveled around the nucleus? Answer: Bohr stated that electrons could only be found in certain distances from the atom (in “electron clouds”) and that each energy level could only hold a single electron. (1) 4. According to Bohr, what is happening in the atom when a photon of light is emitted? Answer: When a photon of light is emitted, there is an electron transition from a higher energy level to a lower energy level (releases energy). (1) 5. According to Bohr, what is happening in the atom when a photon of light is absorbed? Answer: An electron transitions from a lower energy level to a higher energy level (requires energy). 6. (1) When you learned about the energy levels of hydrogen, an energy level diagram was introduced. On this diagram, the n = energy level was represented. Go to the Hydrogen Atom simulation (Unit D), and complete the n = 1 to n = transition. Observe the energy state data. a. What is the energy of the n = energy level? Answer: (1) b. If an electron is initially in the ground state, how much energy must be absorbed by the atom for its transition to the energy level? Answer: 7. In a hydrogen atom, the electron jumps from the n = 1 level to the n = 4 level.

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