Chapter 5-Questions

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Chapter 5 Light 1) The frequency of a wave is A) the number of peaks passing by any point each second. B) measured in cycles per second. C) measured in hertz (Hz). D) equal to the speed of the wave divided by the wavelength of the wave. E) all of the above Answer: E 2) The wavelength of a wave is A) how strong the wave is. B) the distance between a peak of the wave and the next trough. C) the distance between two adjacent peaks of the wave. D) the distance between where the wave is emitted and where it is absorbed. E) equal to the speed of the wave times the wave's frequency. Answer: C 3) How are wavelength, frequency, and energy related for photons of light? A) Longer wavelength means lower frequency and lower energy. B) Longer wavelength means higher frequency and lower energy. C) Longer wavelength means higher frequency and higher energy. D) Longer wavelength means lower frequency and higher energy. E) There is no simple relationship because different photons travel at different speeds. Answer: A 4) From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation? A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio D) gamma rays, X-rays, visible light, ultraviolet, infrared, radio E) radio, X-rays, visible light, ultraviolet, infrared, gamma rays Answer: B 5) Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number? A) The atomic number is 79, and the atomic mass number is 197. B) The atomic number is 79, and the atomic mass number is 118. C) The atomic number is 118, and the atomic mass number is 197. D) The atomic number is 118, and the atomic mass number is 79. Answer: A 6) An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. If it is neutral, how many protons, neutrons, and electrons does it have? A) 26 protons, 30 neutrons, 26 electrons B) 26 protons, 30 neutrons, 30 electrons C) 26 protons, 56 neutrons, 26 electrons D) 13 protons, 43 neutrons, 13 electrons E) 13 protons, 56 neutrons, 13 electrons Answer: A

7) When an atom loses an electron, it becomes A) sublimated. B) dissociated. C) ionized. D) an isotope. E) a plasma. Answer: C 8) How can an electron in an atom lose energy to go from a higher energy level to a lower energy level? A) It loses kinetic energy. B) It releases a photon equal in energy to its own energy drop. C) It absorbs a photon equal in energy to its own energy drop. D) It loses gravitational potential energy. E) It exchanges gravitational potential energy for kinetic energy. Answer: B 9) Which of the following is not a way light and matter interact? A) emission B) absorption C) evaporation D) transmission E) scattering Answer: C 10) If a material is transparent , then it A) reflects light well. B) absorbs light well. C) transmits light well. D) scatters light well. E) emits light well. Answer: C 11) We can see each other in the classroom right now because we A) emit thermal radiation. B) emit visible light. C) emit infrared light. D) reflect visible light. E) reflect infrared light. Answer: D 12) When an electron in an atom goes from a higher energy state to a lower energy state, the atom A) emits a photon of a specific frequency. B) absorbs a photon of a specific frequency. C) absorbs several photons of a specific frequency. D) can emit a photon of any frequency. E) can absorb a photon of any frequency. Answer: A

13) From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet. Answer: B 14) Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. ( Hint : Think about the laws of thermal radiation.) A) The red star is more massive than the blue star. B) The blue star is more massive than the red star. C) The blue star is farther away than the red star. D) The blue star has a hotter surface temperature than the red star. E) The red star has a hotter surface temperature than the blue star. Answer: D 15) Which of the following wavelength regions cannot be studied with telescopes on the ground? A) radio waves B) ultraviolet C) X-rays D) both B and C E) both A and C Answer: D 16) Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. Is the star moving towards or away from us, or can we not tell? A) moving away from us B) moving towards us C) There is not enough information to determine the answer. Answer: B 17) Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. How large is the shift in wavelength? A) 0.02 nm B) 0.2 nm C) 2 nm Answer: B

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