Chapter 27: Q31CQ (page 995)
Can a sound wave in air be polarized? Explain
No, polarization of sound waves is not possible.
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No light passes through two perfect polarizing filters with perpendicular axes. However, if a third polarizing filter is placed between the original two, some light can pass. Why is this? Under what circumstances does most of the light pass?
The limit to the eye’s acuity is actually related to difdfraction by the pupil.
(a) What is the angle between two just-resolvable points of light for a \(3.00 - mm\)-diameter pupil, assuming an average wavelength of \(550{\rm{ }}nm\)?
(b) Take your result to be the practical limit for the eye. What is the greatest possible distance a car can be from you if you can resolve its two headlights, given they are \(1.30{\rm{ }}m\) apart?
(c) What is the distance between two just-resolvable points held at an arm’s length \(\left( {0.800{\rm{ }}m} \right)\) from your eye?
(d) How does your answer to (c) compare to details you normally observe in everyday circumstances?
Can the lines in a diffraction grating be too close together to be useful as a spectroscopic tool for visible light? If so, what type of EM radiation would the grating be suitable for? Explain.
It is possible that there is no minimum in the interference pattern of a single slit. Explain why. Is the same true of double slits and diffraction gratings?
A He–Ne laser beam is reflected from the surface of a CD onto a wall. The brightest spot is the reflected beam at an angle equal to the angle of incidence. However, fringes are also observed. If the wall is 1.50 m from the CD, and the first fringe is 0.600 m from the central maximum, what is the spacing of grooves on the CD?
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