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Chapter 33: Q4Q (page 1000)
Figure 33-28 shows the electric and magnetic fields of an electromagnetic wave at a certain instant. Is the wave traveling into the page or out of the page?
The direction of the wave is into the page.
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The magnetic component of an electromagnetic wave in vacuum has an amplitude of and an angular wave number of What are (a) the frequency of the wave, (b) the rms value of the electric component, and(c) the intensity of the light?
The primary rainbow described in Problem 77 is the type commonly seen in regions where rainbows appear. It is produced by light reflecting once inside the drops. Rarer is the secondary rainbow described in Module 33-5, produced by light reflecting twice inside the drops (Fig. 33-68a). (a) Show that the angular deviation of light entering and then leaving a spherical water drop is
where, k is the number of internal reflections. Using the procedure of Problem 77, find the angle of minimum deviation for (b) red light and (c) blue light in a secondary rainbow. (d) What is the angular width of that rainbow (Fig. 33-21d)?
The tertiary rainbow depends on three internal reflections (Fig. 33-68b). It probably occurs but, as noted in Module 33-5, cannot be seen with the eye because it is very faint and lies in the bright sky surrounding the Sun. What is the angle of minimum deviation for (e) the red light and (f) the blue light in this rainbow? (g) What is the rainbow’s angular width?
The rms value of the electric field in a certain light waveis.What is the amplitude of the associated magnetic field?
A black, totally absorbing piece of cardboard of area intercepts light with an intensity of from a camera strobe light. What radiation pressure is produced on the cardboard by the light?
In Fig. 33-42, unpolarized light is sent into a system of three polarizing sheets, which transmitsthe initial light intensity. The polarizing directions of the first and third sheets are at anglesand.What are the
(a) smaller and
(b) larger possible values of anglefor the polarizing direction of sheet 2?
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