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- Check Your Understanding For the experiment in Example 4.2, at what angle from the center is the third maximum and what is its intensity relative to the central maximum?Consider the single-slit diffraction pattern for =600 nm, D=0.025 mm , and x=2.0 m. Find the intensity in terms of Io at =0.5 , 1.0°, 1.5°, 3.0°, and 10.0°.A first-order Bragg reflection maximum is observed when a monochromatic X-ray falls on a crystal at a 32.3° angle to a reflecting plane. What is the wavelength of this X-ray?
- In our study of diffraction by a single slit, we assume that the length of the slit is much larger than the width. What happens to the diffraction pattern if these two dimensions were comparable?Why is monochromatic light used in the double slit experiment? What would happen if white light were used?An intereference pattern is produced by light with a wavelength of 560 nm from a distant source incident on two identical parallel slits seperated by a distance (between centers) of 0.580 mm. (D) what is the intensity at the angular position of theta2?
- Reflections from the {110} planes of barium titanate, BaTiO3, which has a tetragonal crystalline structure, were observed at glancing angles of 9.13° with Co Ka radiation of wavelength 179 pm. What is the value of the unit cell parameter a?When X-rays of wavelength lambada = 0.20nm are re-flected off the face of a crystal, a Bragg maximum is observed at a glancing angle theta= 17.5 degrees of with sufficient intensity that it is judged to be first order.(a)What is the spacing d of the planes that are paral-lel to the face in question? (b)What are the glancing angles of all higher order maxima?Calculate the R.I. of the antireflection film of minimum thickness 935 A.U. to be coated on solar cell if average wavelength of sunlight is taken as 5500 A.U.
- The light emitted by a helium–neon laser has a wavelengthof 632.8 nm in air. As the light travels from air into zircon,find its (a) speed, (b) wavelength, and (c) frequency, all inthe zircon.Discuss the conditions for interference to occur.What is the lowest frequency that would have a maxima reflection off a n=1.3 material with a345 nm thick n=1.6 coating in terahertz?