Serway_PSE_quick_ch34

Serway_PSE_quick_ch34 - Physics for Scientists and...

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 34 Electromagnetic Waves What is the phase difference between the sinusoidal oscillations of the electric and magnetic fields in this figure? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. impossible to determine 2. 180 3. 90 4. 0 Figure 34.3b shows that the B and E vectors reach their maximum and minimum values at the same time. An electromagnetic wave propagates in the y direction. The electric field at a point in space is momentarily oriented in the + x direction. The magnetic field at that point is momentarily oriented in the 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. x direction 2. + y direction 3. + z direction 4. z direction The B field must be in the + z direction in order that the Poynting vector be directed along the y direction. Which of the following is constant for a plane electromagnetic wave? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. magnitude of the Poynting vector 2. energy density u E 3. energy density u B 4. wave intensity The first three choices are instantaneous values and vary in time. The wave intensity is an average over a full cycle. full cycle....
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Serway_PSE_quick_ch34 - Physics for Scientists and...

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