T3+-+K - PHY 121 Test 3 Key NB: Explanations are provided...

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PHY 121 – Test 3 – Key Fall 2011 1. Ozone molecules strongly absorb a) infrared radiation. b) microwave radiation. c) ultraviolet radiation. d) visible light. e) heat. 2. The substance in the CFCs that deplete the ozone layer is a) carbon b) fluorine c) bromine carbon monoxide e) chlorine 3. Which of the following combined chemical reactions may lead to the depletion of ozone in the ozone layer? a) O 3 + photons → O 2 + O O 3 + O → O 2 + O 2 b) O 2 + photons → O + O O 2 + O → O 3 c) NO + O 3 → NO 2 + O 2 NO 2 + O → NO + O 2 ClO + O 3 → ClO 2 + O 2 ClO 2 + O ClO + O 2 e) Both (c) and (d) 4. Which of the following is true about the ozone hole over Antarctica? a) The ozone hole is only above Arctica not Antarctica… b) If no CFC’s would be released in human activities, there would be not ozone hole c) It is present throughout all seasons of the year It leads to ozone depletion globally e) Fortunately, it affects only the otherwise dispensable populations of penguins 5. The Montreal Protocol agreed to in 1987 a) bans the use of chlorinated fluorocarbons by all countries in the world. b) limit the emissions of carbon monoxide by automobile engines c) limits production of both CFCs and carbon dioxide by all countries. commits developed countries to an intensive research effort in monitoring the ozone hole. e) commits all countries to phase out the use of CFCs. 6. It would be appropriate to measure temperature in ______ and heat in _____. a) degrees, calories b) Btu; Btu c) calories; calories calories; degrees e) both (b) and (c) are correct answers 7. Say that the volume of a container containing a gas is slowly increased. Is it possible to keep the pressure constant inside? a) No, it’s not possible since the gas expands b) Yes, by increasing the volume really slowly c) Yes, by gradually increasing the temperature Yes, by gradually decreasing the temperature e) Yes, by forcing the temperature to stay constant NB: Explanations are provided only for questions requiring quantitative answers.
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PHY 121 – Test 3 – Key Fall 2011 8. The ideal gas model assumes that molecules are particles in random motion with the pressure onto the walls of a container exerted via many individual collisions. Say that two containers A and B have a common wall, and the temperature in A is twice as large as the temperature in B. Consider a molecule in container A colliding with the common wall. Which of the following statements is true about this molecule? a) The collision will result into a net transfer of energy (heat) from A to B and the thermal energy of the particle decreases b) The collision will result into a net transfer of energy (heat) from B to A and the thermal energy of the particle increases c) The collisions in ideal gasses are always elastic, so the particle has the same kinetic energy before and after the collision d) The collisions in ideal gasses are always elastic, so the more collisions the particle experiences, the more kinetic energy will be acquired by the particle e) The average thermal energy of the particle in A is half the thermal energy of the particles in B 9. An ideal gas at temperature
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This note was uploaded on 03/19/2012 for the course PHYSICS phy 121 taught by Professor Mario during the Fall '11 term at Miami University.

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T3+-+K - PHY 121 Test 3 Key NB: Explanations are provided...

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