HW28soln - parallel slits of width a and separation...

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Physics 21 Fall 2007 Solution to HW-28 YF 33.27 Unpolarized light of intensity 17.2 W/cm^2 is incident on two polarizing filters. The axis of the first filter is at an angle of 23.4 o counterclockwise from the vertical (viewed in the direction the light is traveling) and the axis of the second filter is at 66.6 o counterclockwise from the vertical. What is the intensity of the light after it has passed through the second polarizer? 36.5 Diffraction occurs for all types of waves, including sound waves. High-frequency sound from a distant source with wave- length 9.40 cm passes through a narrow slit 12.0 cm} wide. A microphone is placed 45.0 cm directly in front of the center of the slit, corresponding to point O in the figure 36.5a in the textbook. The microphone is then moved in a direction perpendicular to the line from the center of the slit to point O . At what minimal dis- tance from O will the intensity detected by the microphone be zero? YF 36.24 An interference pattern is produced by two identical
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Unformatted text preview: parallel slits of width a and separation (between centers) d = 3 a . Give the number m of the first interference maxima that will be missing in the pattern. K 22.19 The opening to a cave is a tall crack 43.0 cm wide. A bat that is preparing to leave the cave emits a 31.0 kHz ultrasonic chirp. How wide is the "sound beam" 110 m outside the cave opening? Use exact formulas; don't make small angle approximations. Use v_sound =340 m/s. YF 36.26 A diffraction experiment involving two thin parallel slits yields the pattern of closely spaced bright and dark fringes shown in the figure. Only the central portion of the pattern is shown in the figure. The bright spots are equally spaced at 1.53 mm center to center (except for the missing spots) on a screen 2.40 m from the slits. The light source was a He-Ne laser producing a wavelength of 632.8 nm. (A) How far apart are the two slits? (B) How wide is each one? spacing of bright spots is 1.53 mm...
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