Lecture%2032%202220%20Spring%202009

Lecture%2032%202220%20Spring%202009 - 1 Reminders and...

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Unformatted text preview: 1 Reminders and Announcements Exam 2 results are posted (with curve) HW 19 is due Friday (will be posted this afternoon afternoon) Help Room Hours (Physics 117): M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Maxwells Equations Led to prediction of the electromagnetic (em) spectrum Showed that electricity and magnetism are Showed that electricity and magnetism are different aspects of the same thing (forces unified) Motivated Einsteins theory of relativity Wave Equation E x B t = B x E t o o = 2 2 2 2 E x E t o o = 2 2 2 2 B x B t o o = Plane em Waves We will assume that the vectors for the electric and magnetic fields in an em wave have a specific space- time behavior that is time behavior that is consistent with Maxwells equations Assume an em wave that travels in the x direction with E and B as shown Properties of em Waves The solutions of Maxwells third and fourth equations are wave-like, with both E and B satisfying a wave equation Electromagnetic waves travel at the speed of light: This comes from the solution of Maxwells equations Substituting the values for o and o gives c = 2.99792 x 10 8 m/s 1 o o c = The simplest solution to the partial differential...
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Lecture%2032%202220%20Spring%202009 - 1 Reminders and...

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