#3 - Lecture 3 Light and Color for Nonscientists PHYS 1230...

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Lecture 3 Light and Color for Nonscientists PHYS 1230 How do we generate light? How do we detect light? Concept of resonance
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In vacuum speed = c = distance time = λ T = f
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Light is electromagnetic waves zipping through space at speed of light. Speed of light = c = 3x10 8 m/s. Different colors are different wavelengths and frequencies Green Blue Red ??? what is something with wave like this called?
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Static electromagnetic fields • Positive and negative charges generate electric fields that we can draw as field lines • Electric field lines from charges behave like stretched strings • Electric fields generate static sparks • Magnetic fields also have lines of force leading to magnetism Positive charge http://library.thinkquest.org/10796/ch12/ch12.htm Negative charge
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Static electromagnetic fields • Positive and negative charges generate electric fields that we can draw as field lines • Electric field lines from charges behave like stretched strings • Electric fields generate static sparks • Magnetic fields also have lines of force leading to magnetism Positive charge http://library.thinkquest.org/10796/ch12/ch12.htm Negative charge
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Static electromagnetic fields • Positive and negative charges generate electric fields that we can draw as field lines • Electric field lines from charges behave like stretched strings • Electric fields generate static sparks • Magnetic fields also have lines of force leading to magnetism http://phet.colorado.edu/new/simulations/sims.php?sim=Electric_Field_Hockey http://www.colorado.edu/physics/2000/waves_particles/wavpart3.html
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Sample solution to Electric Field Hockey http://phet.colorado.edu/new/simulations/sims.php?sim=Electric_Field_Hockey http://www.colorado.edu/physics/2000/waves_particles/wavpart3.html
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How do we generate a wave on a rope? A) Drop one end B) Raise and lower one end quickly C) Drop both ends D) Twing it in the center http://phet.colorado.edu/new/simulations/sims.php?sim=Wave_on_a_String
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How do we generate light waves? • How do we make waves in the electromagnetic field? • Let’s wriggle the charges. .. • Light waves are disturbances in the electromagnetic field , a nonmaterial physical entity whose equilibrium state is vacuum So an electromagnetic wave is a propagating loop of field lines http://www.colorado.edu/physics/2000/waves_particles/wavpart4.html
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How do we generate light waves? • How do we make waves in the electromagnetic field? • Let’s wriggle the charges. .. • Light waves are disturbances in the electromagnetic field , a nonmaterial physical entity whose equilibrium state is vacuum So an electromagnetic wave is a propagating loop of field lines http://phet.colorado.edu/new/simulations/sims.php?sim=Radio_Waves_and_Electromagnetic_Fields
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http://micro.magnet.fsu.edu/primer/java/polarizedlight/emwave/index.html ELECTROMAGNETIC WAVE PROPAGATION Electromagnetic waves can be generated by a variety of methods, such as a discharging spark or by an oscillating electrons in an atom or molecular. As the current oscillates up
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#3 - Lecture 3 Light and Color for Nonscientists PHYS 1230...

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