4/14/06 More Electromagnetic Waves Monday’s Reading: Section 14.1: Sunlight (pp. 443 – 453) Upcoming Reading Assignments: Section 14.2: Discharge Lamps (pp. 454 – 463) Section 14.3: Lasers and LEDs (pp. 464 – 470) Section 15.1: Cameras (pp. 478 – 488) Section 15.2: Optical Recording and Communication (pp. 489 – 497) Poster Session Meetings !?!?

Direction of EM Waves & Polarization EM wave made up of Electric field and Magnetic field E perpendicular to B Direction of wave perpendicular to E and B Exercise: The Electric field part of an EM wave oscillates IN and OUT of the screen. What are possible directions of the Magnetic field part of this EM wave? Follow-up Exercise: An EM wave is moving to the LEFT. At some instant at some point, the Electric field points OUT of the screen. At this instant at this point, what is the direction of the Magnetic field?

Polarization: Linear and Circular Work in groups of 2 Obtain a slinky (please return at end) Follow instructions

Making a Radio Wave