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Chapter 33: Q103P (page 1009)
The rms value of the electric field in a certain light waveis.What is the amplitude of the associated magnetic field?
The amplitude of the associated magnetic field is
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Suppose we rotate the second sheet in Fig. 33-15a, starting with the polarization direction aligned with the y axisand ending with it aligned with the x-axis. Which of the four curves in Fig. 33-26 best shows the intensity of the light through the three-sheet system during thisrotation?
Radiation from the Sun reaching Earth (just outside the atmosphere) has an intensity of . (a) Assuming that Earth (and its atmosphere) behaves like a flat disk perpendicular to the Sun’s rays and that all the incident energy is absorbed, calculate the force on Earth due to radiation pressure. (b) For comparison, calculate the force due to the Sun’s gravitational attraction.
At a beach, the light is generally partially polarized due to reflections off sand and water. At a particular beach on a particular day near sundown, the horizontal component of the electric field vector is times the vertical component. A standing sunbather puts on polarizing sunglasses; the glasses eliminate the horizontal field component.
(a) What fraction of the light intensity received before the glasses were put on now reaches the sunbather’s eyes?
(b) The sunbather, still wearing the glasses, lies on his side. What fraction of the light intensity received before the glasses were put on now reaches his eyes?
Figure 33-32 shows four long horizontal layers A–D of different materials, with air above and below them. The index of refraction of each material is given. Rays of light are sent into the left end of each layer as shown. In which layer is there the possibility of totally trapping the light in that layer so that, after many reflections, all the light reaches the right end of the layer?
Figure 33-30 shows rays of monochromatic light propagating through three materials a, b, and c. Rank the materials according to the index of refraction, greatest first.
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