Chapter_4_test - 1 When a rod of metal is heated intensely...

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1. When a rod of metal is heated intensely, its predominant color will A) remain predominantly red as the intensity of light increases. B) change from red through orange to white and then to blue. C) change from blue through white, then orange, and finally red, when it becomes red-hot at its hottest. D) be white, all colors mixed together, as the intensity of light increases. Ans: B Section: 4-1 2. Pieces of metal are heated by varying amounts in a flame. The hottest of these will be the one that shows which color most prominently? A) Red B) Black C) Yellow D) Blue Ans: D Section: 4-1 3. What changes would you expect to see in the resulting spectrum of emitted light from a piece of metal when it is heated slowly in an intense flame from 500 K to 1500 K? A) The intensity of radiation would increase greatly, while the color would change from blue through white to red. B) The intensity of radiation would increase greatly, and its color would change from red through white to blue. C) The intensity of radiation would increase greatly, while its color would remain a dull red. D) The intensity of radiation would increase only slightly, while the color would change from red through white to blue. Ans: B Section: 4-1 4. The temperature scale most often used by scientists is the A) Kelvin scale. B) Richter scale. C) Fahrenheit scale. D) Celsius scale. Ans: A Section: Toolbox A-1 5. The Kelvin scale measures A) temperature in Fahrenheit-sized degrees above absolute zero. B) temperature referenced to zero at the freezing point of water. C) mass per unit volume, or density, with water having a value of 1.0. D) temperature in Celsius-sized degrees above absolute zero. Ans: D Section: Toolbox A-1
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6. What is the main reason that astronomers (and other scientists) almost always use the Kelvin (absolute) temperature scale rather than the Celsius or Fahrenheit scales? A) The scale has a physically meaningful absolute zero of temperature. B) The temperature of freezing and boiling water are easier to remember. C) Calculations are easier on the Kelvin scale. D) The size of each degree (or unit) of temperature is more convenient. Ans: A Section: Toolbox A-1 7. A typical but very cool star might have a temperature of 3100° Celsius. On the Kelvin scale, this is about A) 3373 K. B) 3068 K because 0 K, the freezing point of water, is 32°C. C) the same number, 3100 K, because the Kelvin and Celsius scales are the same. D) 2827 K. Ans: A Section: Toolbox A-1 8. A scientist reports that his measurement of the temperature of the surface of a newly discovered planet is –20 K. What conclusion can you draw from this report? A) The scientist measured only the dark side of the planet, away from the Sun. B)
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This note was uploaded on 11/16/2010 for the course ASTRO 194977 taught by Professor Habib during the Spring '10 term at Ventura College.

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Chapter_4_test - 1 When a rod of metal is heated intensely...

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