{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

This preview shows pages 1–12. Sign up to view the full content.

Lecture 3 Light and Color for Nonscientists PHYS 1230 How do we generate light? How do we detect light? Concept of resonance

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
In vacuum speed = c = distance time = λ T = f
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?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 32

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

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online