>>>>>>>>WHEN YOU FINISH <<<<<<<< Hand in the answer sheet separately.

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1 Instructor: Prof. Seiberling PHYSICS DEPARTMENT MET st Midterm Exam Sept. 23, 2002 Name (print, last rst): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use 76{80 for the 5-digit number). Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY. Code your student number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout with scratch work most questions demand. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink. Do not make any stray marks or the answer sheet may not read properly. If you believe there is no correct answer listed, leave the answer spaces blank. (5) The answers are rounded o. Choose the closest to exact. There is no penalty for guessing. >>>>>>>>WHEN YOU FINISH <<<<<<<< Hand in the answer sheet separately. There are 32 multiple choice questions. Clearly mark the one best answer for each question. If more than one answer is marked, no credit will be given for that question, even if one of the marked answers is correct. Guessing an answer is better than leaving it blank. All questions are worth 3 points, except for 4 questions, which are worth 4 points. The 4-point questions are clearly indicated. Good Luck! 1. The appearance of a dimly visible \watery sun" through a deck of gray clouds is usually a good indication that the clouds are: (1) angelitus (2) altostratus (3) cirrostratus (4) nimbostratus (5) stratus 2. Clouds infrared radiation and visible radiation. (1) absorb, re ect (2) re ect, re ect (3) absorb, absorb (4) emit, absorb (5) re ect, absorb 3. The temperature of the tropopause: (1) is close to the temperature at the earth's surface (2) is nearly the same as the sun's temperature (3) has never been measured (4) is much warmer than the temperature at the earth's surface (5) is much colder than the temperature at the earth's surface 4. Water vapor: (1) makes the sky hazy (2) is invisible (3) makes clouds white (4) colors the sky blue (5) is very small drops of liquid water

2 5. The bending of light that occurs when it enters and passes through a substance of di erent density is called: (1) refraction (2) di raction (3) re ection (4) scattering (5) absorption 6. The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the: (1) higher air temperature in the Gulf States (2) higher water temperature in the Paci c Ocean (3) lower air temperature in Southern California (4) higher water temperature in the Gulf of Mexico (5) low relative humidity of the air over the Paci c Ocean 7. At which city might you be able to observe cirrus clouds at an altitude of 3000 m (10,000 feet) above the surface? (1) Chicago, Illinois (2) Honolulu, Hawaii (3) Waldo, Florida (4) Yuma, Arizona (5) Barrow, Alaska 8. A radiation inversion is most commonly observed: (1) in the upper atmosphere (2) at sunset (3) within a few meters of the ground (4) during the afternoon (5) when it is raining 9. On what day would you expect the sun to be overhead at Lima, Peru (latitude 12 ± S)? (1) August 15 (2) April 21 (3) December 22 (4) March 10 (5) February During the course of a year the sun will disappear from view near the North Pole on what date? (1) June 21 (2) December 23 (3) September 23 (4) January 1 (5) March (4 pts) How many heating degree-days would there be for a week in which the maximum temperature was 60 ± F each day and the minimum temperature was 40 ± F each day? (Assume a base temperature of 65 ± F) (1) 35 (2) 140 (3) 105 (4) 175 (5) (4 pts) A laser pulse is sent vertically up toward a bank of cumulus clouds. If the pulse is re ected by the base of the clouds and returns to the ground at the position of the transmitter/receiver in a round trip time of 20 microseconds, how high is the base of the clouds? (The speed of light is meters/second) (1) 2000 meters (2) 3000 meters (3) 600 meters (4) 1500 meters (5) 2500 meters

3 13. Clouds in the tropics tend to move from east to west. Consequently, which rhyme best describes a rainbow seen in the tropics? (1) roses are red, violets are blue, what rainbows mean I haven't a clue (2) rainbow at the break of day, means that the rain is on the way (3) rainbow at the break of dawn, means, of course, the rain is gone (4) rainbow with a setting sun, means that sailors can have some fun (5) rainbow in the morning, means that sailors should take warning 14. Which below is not considered a greenhouse gas? (1) nitrous oxide (N 2 O) (2) methane (CH 4 ) (3) water vapor (H 2 O) (4) oxygen (O 2 ) (5) carbon dioxide (CO 2 ) 15. Which relates to weather rather than climate? (1) The average temperature for the month of January is 28 ± F (2) the lowest temperature ever recorded in Frozenlake, Minnesota is 57 ± F (3) Outside it is cloudy and snowing (4) I like the warm, humid summers (5) the foggiest month of the year is December 16. The amount of force exerted over an area of surface is called: (1) pressure (2) weight (3) density (4) temperature (5) work 17. In calm air the air temperature is 10 ± C, if the wind speed should increase to 30 knots (with no change in air temperature) the thermometer would indicate: (1) a temperature of 30 ± C (2) a much higher temperature than 10 ± C (3) a temperature of 0 ± C (4) a much lower temperature than 10 ± C (5) a temperature of 10 ± C 18. A mirage is caused by: (1) being too thirsty (2) the bending of light by air of di erent densities (3) a thin layer of moist air near the ground (4) re ection of light from a hot surface (5) scattering of light by air molecules 19. If the temperature of the air is said to be at absolute zero, one might conclude that: (1) the motion of the molecules is at a maximum (2) the air temperature is 0 ± C (3) the molecules contain a minimum amount of energy (4) the temperature is 0 ± F (5) the molecules are occupying a large volume

4 20. Fog that forms o the coast of Newfoundland is mainly a form of: (1) radiation fog (2) upslope fog (3) frontal fog (4) advection fog (5) steam fog 21. Fog that most often forms as warm rain falls into a cold layer of surface air is called: (1) evaporation (mixing) fog (2) radiation fog (3) advection fog (4) frontal fog (5) upslope fog 22. The earth is tilted at an angle of 23.5 ± with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40 ±, we would expect in middle latitudes (latitudes 30 ± to 50 ± ): (1) hotter summers and milder winters than at present (2) cooler summers and colder winters than at present (3) no appreciable change from present conditions (4) hotter summers and colder winters than at present (5) cooler summers and milder winters than at present 23. High fog is also called (1) cirrus (2) steam fog (3) cumulus (4) stratus (5) frost 24. Polar orbiting satellites: (1) on each successive orbit view an area to the west of the previous orbit (2) remain above a xed point over the North or South Pole (3) remain above a xed point over the equator (4) pass directly over the same place on each orbit (5) follow a line of constant latitude around the earth 25. What color would the sky be if air molecules selectively scattered only the longest wavelengths of visible light? (1) red (2) white (3) black (4) blue (5) green 26. Heat transferred outward from the surface of the moon can take place by: (1) radiation (2) latent heat (3) convection (4) advection (5) conduction 27. When the air temperature of a parcel increases, the saturation vapor pressure will and the relative humidity will. (1) decrease, decrease (2) decrease, increase (3) remain the same, decrease (4) increase, decrease (5) increase, increase 28. (4 pts) For this and the next question, refer to the gure provided. Suppose you have a parcel of air represented by the dot on the gure. You slowly reduce the temperature of the parcel down to 10 ± C at constant air pressure. Assume ample condensation nuclei exist in the parcel. By how much has the water vapor pressure changed when you get to 10 ± C? (1) no change (2) increased by 12 mb (3) reduced by 20 mb (4) increased by 22 mb (5) reduced by 8 mb

5 29. If you have a parcel of air at the dot in the gure, then you double the number of water vapor molecules in the parcel, what would be the new relative humidity in the parcel? (1) 50% (2) 75% (3) 100% (4) 0% (5) 25% 30. (4 pts) If 1: Cal of heat is added to a 2.5 kg sample of water in an insulated beaker, by how much does the temperature of the water rise? [The speci c heat of water is 1.0 Cal / (gram ± C)] (1) 1.7 ± C (2) 15 ± C (3) 6 ± C (4) 25 ± C (5) 250 ± C 31. I have a dog named Albedo, who has a very high albedo. What can you conclude about Albedo? (1) he is smart (2) he gets dizzy easily (3) he is hyperactive (4) he is usually hot (5) he is white 32. Where are the days and nights of equal length all year long? (1) at the Equator (2) nowhere (3) at 23.5 ± (4) at 66.5 ± (5) at the poles