Infrared and Raman spectra are complementary to each other. a) True b) False
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Infrared and Raman spectra are complementary to each other.
a) True
b) False
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- 57. The retina of a human eye can detect light when radiant energy incident on it is at least 4.00×10−17 J. For light of 595−nm wavelength, how many photons does this energy correspond to?4. In an experiment on the photoelectric effect, a metal is illuminated by visible light of different wavelengths. A photoelectron has a maximum kinetic energy of 0.9 eV when red light of wavelength 640 nm is used. With blue light of wavelength 420 nm, the maximum kinetic energy of the photoelectron is 1.9 eV. Use this information to calculate an experimental value for the Planck constant h. [The figure below depicts spectral reflectance measurements for three different materials: a green leaf from a healthy plant, a sheet of shiny blue paper, and the palm of a human hand. The measurements are labeled 1 (black line), 2 (red line), and 3 (blue line). Match the measurements to the most appropriate material type
- 3.2 (a) Determine the absorption coefficient for Si illumination form radiation with wavelength equal to 0.5 μm. (b) Calculate the thickness of Si that will absorb 60, 70, 80 and 90% of the photon energy/cm²s). Raman scattering takes into account a. The energy transitions between orbitals b. The energy transition from molecules in rotation motion c. The energy transition from molecules in translational motion d. Energy is absorbed in the substance being probedIn relation to x-ray imaging, which of the following statements is true? Choose one answer. a. The linear attenuation coefficient of a material is directly proportional to its half value thickness. b. For clinically useful x-rays, lead has a greater half value thickness than soft tissue. c. The intensity of an x-ray beam decreases exponentially as it passes through tissue. d. The intensity of an x-ray beam increases exponentially as it passes through tissue. e. Good contrast media are generally poor absorbers of X-rays. and Why??