Chapter 20: Q1P (page 525)
Describe the role of each component of the spectrophotometer.
Spectrophotometer: It is an optical instrument that measures intensity of light in relation to the wawelength.
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(a) What resolution is required for a diffraction grating to resolve wavelengths of 512.23 and 512.26 nm? (b) With a resolution of 104, how close in nm is the closest line to 512.23 nm that can barely be resolved? (c) Calculate the fourth-order resolution of a grating that is 8.00 cm long and is ruled at 185 lines/mm. (d) Find the angular dispersion () between light rays with wavelengths of 512.23 and 512.26 nm for first-order diffraction (n 5 1) and thirtieth-order diffraction from a grating with 250 lines/mm and f 5 3.08.
Explain why the transmission spectrum is calculated from the quotient (sample transform) M(background transform) instead of the difference (sample transform) - (background transform).
Explain how a laser generates light. List important properties of laser light.
What level of stray light gives an absorbance error of 0.01 at an absorbance of 2? That is, what value of Sgives an apparent absorbance of 1.99?
(a) A particular silica glass waveguide is reported to have a loss coefficient of(power out/power in, defined in Problem 20-22) for 514-nm-wavelength light. The thickness of the waveguide is and the length is 3.0 cm. The angle of incidencein the figure ) is . What fraction of the incident radiant intensity is transmitted through the waveguide?
(b) If the index of refraction of the waveguide material is 1.5, what is the wavelength of light inside the waveguide? What is the frequency?
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