Lecture6_EAS1600_Fall07

Lecture6_EAS1600_Fall07 - EAS 1600 Introduction to...

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EAS 1600 Introduction to Environmental Sciences Lecture 6 Radiation Electromagnetic and Black Body
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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 three 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.
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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 or individual packets of energy ¾ E = h ν = hc/ λ ¾ Where h = Planck’s constant = 6.63 x 10 -34 Js
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BASIC CONCEPTS: 2. Electromagnetic Spectrum
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Lecture6_EAS1600_Fall07 - EAS 1600 Introduction to...

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