ABSORPTION AND RADIATION BY LAND AND WATER



Name: __________________________________________ Date: ______________Class: _________ v3ABSORPTION AND RADIATION BY LAND AND WATERIntroduction: Approximately 70 percent of Earth’s surface is covered by water. The unequal rates of the heating of land and water cause temperature conditions which significantly affect local and world-wide weather patterns.Objective: You will be able to describe the comparative rates at which water and land surfaces heat and cool.Materials: 3 cups, IR thermometerHeat lamp and ring standsand, waterscaleVocabulary: specific heatradiationProcedure: Fill a cup nearly full with room temperature water, and another with dry sand, and another with wet sandWeigh all 3 cups in grams:Dry Soil temp. (°C)Wet Soil temp. (°C)Water temp. (°C)Place the three cups under the heat lamp and adjust the lamp so that the cups will receive equal energy.Turn on the heat lamp and take readings with the IR thermometer at one minute intervals for 10 minutes.Record these temperatures on your Report Sheet. (see below)At the end of 10 minutes, turn off the lamp and move it away from the cups.Continue reading and recording the temperature of both cups each minute for the next 10 minutes.Plot a graph showing both sets of data on one set of axes. Use time on the horizontal axis and use a different color for each line.Data Recording SheetHeat Lamp ONHeat Lamp OFF and AWAYTime (min)Dry Soil temp. (°C)Wet Soil temp. (°C)Water temp. (°C)Time (min)Dry Soil temp. (°C)Wet Soil temp. (°C)Water temp. (°C) 0XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1111221331441551661771881992010XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXGraph 5423535-203835Key:00Key:Title: Calculations: Calculate the average rate at which each variable is increasing and decreasing in temperature.Discussion Questions: 1. How did the heat energy received by the cup of the soil compare to the heat energy received by the cup of water?Which cup heated more rapidly? Which cup cooled more rapidly?Which is a better absorber and radiator of heat energy, sand or water?What is the impact of the water with the sand? Why?Explain why the cup of water should show less temperature change in 20 minutes than the container of soil.On Long Island, in the summer time, why is it generally cooler on the beach than it is more inland? Referring to Question 5, how would density of the air over the ocean compare to the density of air over the nearby land?List the sources of error and tell how each error specifically affects your results.Conclusion: How do water and land surfaces differ in their abilities to absorb and radiate heat energy? Practice Questions: Most of the energy in the Earth's atmosphere comes fromA) the rotation of the Earth and wind from the EarthB) the rotation and revolution of the EarthC) radioactive decay of elements and radiation from the EarthD) radiation from the Earth and insolation from the SunHow much heat energy is required to raise the temperature of 10. grams of granite from 20.DC to 50.DC?A) 500 calB) 57 calC) 1.9 calD) 300 calThe diagram below represents a landscape profile. Points A, B, C, D, and E are locations in the mid-latitudes of the Northern Hemisphere.124841069278500At which location would the daily temperature range during the month of July be smallest?A) B B) E C) C D) D ................
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