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Chapter 35: Q17P (page 1075)
In Fig. 35-37, two radio frequency point sources and , separated by distance , are radiating in phase with . A detector moves in a large circular path around the two sources in a plane containing them. How many maxima does it detect?
The total number of the maxima is 16.
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In Fig. 35-45, two microscope slides touch at one end and are separated at the other end. When light of wavelength 500 nm shines vertically down on the slides, an overhead observer sees an interference pattern on the slides with the dark fringes separated by 1.2 mm. What is the angle between the slides?
The wavelength of yellow sodium light in air is 589 nm. (a) What is its frequency? (b) What is its wavelength in glass whose index of refraction is 1.52? (c) From the results of (a) and (b), find its speed in this glass.
In Fig. 35-33, two light pulses are sent through layers of plastic with thicknesses of either or as shown and indexes of refraction , , , , , and . (a) Which pulse travels through the plastic in less time? (b) What multiple of gives the difference in the traversal times of the pulses?
Reflection by thin layers. In Fig. 35-42, light is incident perpendicularly on a thin layer of material 2 that lies between (thicker) materials 1 and 3. (The rays are tilted only for clarity.) The waves of rays and interfere, and here we consider the type of interference to be either maximum (max) or minimum (min). For this situation, each problem in Table 35- 2 refers to the indexes of refraction , localid="1663139751503" and , the type of interference, the thin-layer thickness in nanometres, and the wavelength in nanometres of the light as measured in air. Where is missing, give the wavelength that is in the visible range. Where is missing, give the second least thickness or the third least thickness as indicated.
Does the spacing between fringes in a two-slit interference pattern increase, decrease, or stay the same if
(a) the slit separation is increased,
(b) the color of the light is switched from red to blue, and
(c) the whole apparatus is submerged in cooking sherry?
(d) If the slits are illuminated with white light, then at any side maximum, does the blue component or the red component peak closer to the central maximum?
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