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Chapter 23: Q21 P (page 988)
A pulse of radiation propagates with velocity . The electric field in the pulse is . What is the magnetic field in the pulse?
The magnetic field in the pulse is .
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If a beam of light from a medium with a higher indexof refraction emerges into a medium with a lower index ofrefraction, what happens? (1) The emerging beam bends towardthe normal (smaller angle). (2) The emerging beam bends away from the normal (larger angle). (3) The emerging beam does notbend at all.
A small laser used as a pointer produces a beam of red light in diameter and has a power output of . What is the magnitude of the electric field in the laser beam?
At dawn, with the Sun just rising in the east, you facethe Sun and bend your head back to look straight up, and youexamine the blue sky light with a Polaroid庐 filter. Why is the lightpolarized? What is the direction of the electric field, east鈥攚est ornorth鈥攕outh? Explain carefully
A slab (pulse) of electromagnetic radiation that is 15cm thick is propagating downward (in the direction) toward a short horizontal copper wire located at the origin and oriented parallel to the z axis, as shown in Figure 23.123. (a) The direction of the electric field inside the slab is out of the page (in the direction). On a diagram, show and describe clearly the direction of the magnetic field inside the slab.
(b) You stand on the x axis at location, at right angles to the direction of propagation of the pulse. Your friend stands on the z axis at location. The pulse passes the copper wire at time , and at a later time you observe new nonzero electric and magnetic fields at your location, but your friend does not. Explain. What is ? (Give a numerical answer.) How long a time do these new fields last for you? (c) On a diagram, show and describe clearly the directions of these new nonzero fields ( and ) at your location. Explain briefly but carefully.
You may have noticed that television antennas onhousetops have metal rods mounted horizontally (Figure 23.112),at least in the United States (we're not talking about satellitedishes). What does this imply about the construction of thetransmitting antennas used by television stations? Why?
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