The wavelength of light fluoresced by molecules is longer than that absorbed bec
ID: 527207 • Letter: T
Question
The wavelength of light fluoresced by molecules is longer than that absorbed because (A) The molecules move faster, which produces a red shift in the fluorescence. (B) Some of the absorbed energy causes bonds in the molecules to break, releasing energy, which results in the longer wavelength. some of the energy absorbed by the molecules is lost to molecular vibrations before the fluorescence is produced, resulting in a longer wavelength. (D) the molecules are excited by the absorption and react with solvent molecules, which changes electronic transition energy and therefore the wavelength. The detector that is most commonly used for measuring the Raman spectra of samples illuminated with a 532-nm (green) laser is a (A) electron multiplier. (B) bolometer array detector. (C) charge-coupled device array detector. (D) deuterated triglycine sulfate (DTGS) detector. The absorbance spectrum of a mixture containing two compounds, A and B, was taken and shown to the right. Pure spectra of A and B with their corresponding concentration can also be found to the right. What is the approximate concentration of A and B in the mixture? (A) [A] = 7.4 times 10^-5 M and [B] = 3 times 10^-5 M [A] = 7.4 times 10^-5 M and [B] = 1 times 10^-4 M (C) [A] = 1 times 10^-4 and [B] = 3 times 10^-5 M (D) [A] and [B] cannot be determined from the available data.Explanation / Answer
21. (D) This is right option because molecules are excited with absorption energy and then in order to come their normal state, It can undergo non-radiative relaxation in which the excitation energy is dissipated as heat (vibrations) to the solvent.
22. (B) Bolometer array detector.
23. (A)
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