NAME __________________________ Remote Sensing of the Environment GEOG/GEOL 4093/5093 Spring Semester 2009 Lab Exercise #1 01/20/2009 Due: 01/27/2009 (1) What is remote sensing? (5) ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ (2) Fill in the blanks in the following table: (8) Wavelength Frequency Name of spectral region a. __________ 88.5 MHz ___________________________ b. 1.0 km ________ ___________________________ c. __________ 37 GHz ___________________________ d. 600 nm ________ ___________________________ e. 10 µm ________ ___________________________ f. __________ 60 Hz ___________________________ g. 5.0 cm ________ ___________________________ h. __________ 1360 kHz ___________________________ (3) What are the peak wavelengths of blackbody emission for objects at the following temperatures? (3) a. 320 K ________________ b. 5700 K ________________ c. 1.0 x 106 K ________________(4) Use the infrared thermometer to measure the temperature of the wall. Note that temperature here _____. Use the infrared thermometer to measure the temperature of the top of a computer monitor. Note that temperature here _____. What is the amount of radiation (Wm-2) being emitted from the wall and from the computer? Use an emissivity of 0.97 for all measurements. Show your work below. (6) (5) Describe Wien’s displacement law. What does it tell us about the relationship between temperature and wavelength? (4) ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ (6) Using an initial temperature of 20 °C and an uncertainty of ± 5%, discuss the sensitivity of the Stefan-Boltzmann law for obtaining emittance. You may need another sheet of paper to show all of your work. (4)
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