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 &quot;sound beam&quot; 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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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .
- Spring '08