lecture 15 what is light?

# 11 maxwells equations maxwell studied the effects of

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Lecture 15: What is light? 11 Maxwell’s Equations Maxwell studied the effects of oscillating electric charges. He found that a pattern of alternating 6/24/2009 Lecture 15: What is light? 12 He found that a pattern of alternating electric and magnetic fields would spread out from the oscillating charge in a wave pattern traveling at the speed of light.

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Chapter 4: Radiation and Spectra 3 Maxwell’s Equations 6/24/2009 Lecture 15: What is light? 13 Today, we call these disturbances “electromagnetic radiation.” Electromagnetic Waves Visible light is an example of an electromagnetic wave . All electromagnetic waves travel at the 6/24/2009 Lecture 15: What is light? 14 All electromagnetic waves travel at the speed of light. Wavelength The wavelength, λ , is the distance from one wavecrest to the next. The wavelength determines the color of the 6/24/2009 Lecture 15: What is light? 15 light. Visible Spectrum Visible spectrum 6/24/2009 Lecture 15: What is light? 16 How many wavelengths of green light would fit across a grain of sand with a diameter of 0.1 mm? A. 50 200 B. C. 500 D. 2000 E. 5000 6/24/2009 Lecture 15: What is light? 17 Electromagnetic Spectrum 6/24/2009 Lecture 15: What is light? 18 Figure 6-2
Chapter 4: Radiation and Spectra 4 Frequency The frequency, ν , is the number of waves that pass a fixed point in one second.

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