MET 1010 Exam 2 Study Guide Dew is most likely to form on a clear calm nights b cloudy calm nights c clear windy nights d cloudy windy nights e rainy nights Answer a clear calm nights The name given to a liquid drop of dew that freezes when the air temp drops below freezing is a frost b black frost c hoar frost d white frost e frozen dew Answer e frozen dew The cooling of the ground to produce dew is mainly the result of a conduction b radiational cooling c cooling due to the release of latent heat d advection Answer b radiational cooling For frozen dew to form a the dew point must be above freezing b the minimum temperature must fall to freezing or below c dew must form and then freeze d all of these Answer d all of these Suppose it is a winter night and at about 10 p m the air cools to the dew point temperature and a thick radiation fog develops If the air continues to cool during the night in 5 hours the dew point temperature will probably a Decrease as the air becomes drier b Increase as the air becomes drier c Decrease as the air becomes wetter d Increase as the air becomes wetter Answer a decrease as the air becomes drier Particles that serve as surfaces on which water vapor may condense are called a hydrophobic nuclei b nacreous nuclei c condensation nuclei d scud Answer c condensation nuclei Frost forms when a objects on the ground cool below the dew point temperature b the dew point is 32 F or below c water vapor changes into ice without first becoming a liquid d all of the above Answer d all of the above On a humid day the causes salty potato chips left outside in an uncovered bowl to turn soggy a repelling of water by hydrophobic condensation nuclei b repelling of water by hygroscopic condensation nuclei c attraction of water by hydrophobic condensation nuclei d attraction of water by hygroscopic condensation nuclei Answer d attraction of water by hygroscopic condensation nuclei Frost typically forms on the inside of a windowpane rather than the outside because a the inside of the pane is colder than the outside b there is more water vapor touching the inside of the pane c there is less water vapor touching the inside of the pane Answer b there is more water vapor touching the inside of the pane Condensation nuclei may be a particles of dust b nitric acid particles c smoke from forest fires d salt from the ocean e all of the above Answer a particles of dust Condensation nuclei are important in the atmosphere because a they provide most of the minerals found in water b they make it easier for condensation to occur in the atmosphere c they are the sole producers of smog d they filter out sunlight e they provide the only means we have of tracking wind motions Answer b they make it easier for condensation to occur in the atmosphere Under what circumstances could the relative humidity exceed 100 percent without producing fog a The dew point is higher than the air temperature b The air is perfectly dry c There are no condensation nuclei present d There are too many electrically charged ions in the air Answer c There are no condensation nuclei present Wet haze forms when the relative humidity is a equal to 100 percent b above 100 percent c less than 100 percent d equal to the dew point temperature Answer c less than 100 percent On a cold winter morning the air near the surface is full of smoke particles If fog should form in this air it will probably be fog that forms in cleaner air a thicker than b thinner than c practically the same as d different color than Answer a thicker than High fog is also called a stratus b cumulus c cirrus d frost Answer a stratus When radiation fog burns off the fog tends to dissipate a from the bottom up b from the top down c starting at the middle and working both upward and downward Answer a from the bottom up When fog burns off it a absorbs sunlight and warms up b evaporates c thickens from the ground up d settles to the ground in the form of rain Answer b evaporates On a clear night the minimum temperature drops to 34 F The following night fog forms early in the evening It is a good bet the minimum temperature will not be as low because of the a enhancement of the greenhouse effect by the fog cloud b trapping of smoke and dust by the water vapor c calm winds that accompany fog d all of the above Answer a enhancement of the greenhouse effect by the fog cloud Winter fog in the Central Valley region of California is mainly due to a adiabatic cooling b radiational cooling c advection of cold air d uplift e evaporation of water from rivers Answer b radiational cooling On a cold winter morning the most likely place for radiation fog to form is a at the top of a hill or mountain b in a valley c along the side of a hill d over a body of water Answer b in a valley The fog that forms along the Pacific coastline of North America is mainly which type a radiation fog b upslope fog c frontal fog d advection fog e steam fog Answer d advection fog Fog that forms off the coast of Newfoundland is mainly a form of a advection fog b frontal fog c steam fog d radiation fog e upslope fog Answer a advection fog Along an irregular coastline advection fog is more likely to form at the headlands than at the beaches because of the surface winds and air a converging sinking b diverging sinking c converging rising d diverging rising Answer c converging rising If fog is forming at Denver Colorado and the wind is blowing from the east then the fog is most likely a advection fog b frontal fog c upslope fog d radiation fog Answer c upslope fog Exhaled breath from your mouth can condense when a it is very cold b it is very warm and humid c the addition of water vapor from your breath causes the air s relative humidity to exceed 100 percent d all of these Answer d all of these When you see your breath on a cold morning the air temperature a must be above freezing b must be below freezing c can be above or below freezing d must be equal to the relative humidity Answer c can be above or below freezing The use of helicopters to mix the air and disperse radiation fog at airports is effective provided that a the fog layer is not deep b the liquid water content of the fog is low c the liquid water content of the fog is high d both the fog layer is not deep and the liquid water …
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