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# Lecture7_Radiation - EAS 1600 Introduction to Environmental...

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EAS 1600 Introduction to Environmental Sciences Class 6 Solar Radiation and Effective Temperature We now begin an investigation of the Earth’s climate, by focusing on the so-called Earth’s energy budget. The fundamental physical law that underpins this discussion is the First Law of Thermodynamics ; that is, the conservation of energy. The next two lectures focus on how electromagnetic radiation (e.g., light) interacts with the Earth and helps determine climate. Today, we introduce some basic concepts about electromagnetic radiation and how solar radiation interacts with a planet like the Earth. BASIC CONCEPTS: 1. Electromagnetic Radiation ¾ Propagation of energy involving coupled electric and magnetic waves ¾ Waves are characterized by: ¾ Wavelength, λ ¾ Frequency, ν ¾ Speed, c ¾ where c = λ ν = 3 x 10 8 m/s ¾ Radiation also acts as stream of photons ¾ E = h ν = hc/ λ ¾ Where h = Planck’s constant = 6.63 x 10 -34 Js Select all the correct statements about electro-magnetic radiation. A. As wavelength increases, phase speed increases B. As wavelength increases, photon energy decreases C. As wavelength increases, frequency decreases. D. Phase speed is independent of wavelength.

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BASIC CONCEPTS: 2. Electromagnetic Spectrum ¾ Forms of electromagnetic radiation determined by λ and ν ¾ Unit of wavelength: nanometers or nm, micrometers, μ m ¾ In the visible, different wavelengths are perceived as different colors Electromagnetic Spectrum http://cimss.ssec.wisc.edu/satmet/modules/spectrum/spectrum.html BASIC CONCEPTS: 3. Radiative Flux ¾ Flux is rate at which energy or mass passes through a unit area.
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Lecture7_Radiation - EAS 1600 Introduction to Environmental...

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