Why are rotational transitions of little use to a spectroscopist?

  1. Home

- Online Exam Test Papers | - MCQs[multiple choice questions and answers ] | - Mock Test Papers | - Practice Papers | - Sample Test Papers |

Question:
 
Why are rotational transitions of little use to a spectroscopist?

1.Because the energy required to induce a rotational transition is so small that it cannot be measured

2.Because rotational transitions are extremely rare

3. Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions

4.All of the above

Posted Date:-2021-03-07 11:58:19

More MCQS Questions and answers

  1. In which of the following cell organelles, it is expected to find the biochemical reactions that harness energy from the breakdown of sugar molecules to synthesize large amounts of ATP?
  2. Which of the following are responsible causing the diseases?
  3. Why are rotational transitions of little use to a spectroscopist?
  4. Why are rotational transitions of little use to a spectroscopist?
  5. Beer's Law states that A. absorbance is proportional to both the path length and concentration of the absorbing species B. absorbance is proportional to the log of the concentration of the absorbing species C. absorbance is equal to P0 / P D. none of the above
  6. Ion exchange chromatography is based on the
  7. The simplest way to differentiate a prokaryotic cell from a eukaryotic one is to
  8. A certain cell organelle which is made of a double phospholipid bilayer that has many large pores in it, is most likely
  9. A combination of paper chromatography and electrophoresis involves
  10. A gradient elution in HPLC is one in which the composition of the solvent
  11. A simple harmonic oscillator may absorb energy
  12. According to the fluid mosaic model of cell membranes,
  13. An eluotropic series
  14. An isocratic elution in HPLC is one in which the composition of the solvent
  15. An organism's first line of defense against attack by an invader such as a virus or bacterium is usually
  16. Clearly defined nucleus, mitochondria in a large central vacuole and chloroplasts, indicate the group of organisms from
  17. Column efficiency is measured in terms of number of plates which is
  18. Dwell volume is defined as
  19. Eukaryotic cells are more efficient than prokaryotes because their internal compartmentalization
  20. Fluorescence occurs when
  21. For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?
  22. For a typical adsorbent such as silica gel, the most popular pore diameters are
  23. HPLC methods include
  24. HPLC stands for
  25. Hydrogen bonds in a-helices are
  26. In gas chromatography, the basis for separation of the components of the volatile material is the difference in
  27. In normal phase HPLC, there is a A. non polar solvent/polar column B. polar solvent/non-polar column C. non polar solvent/non-polar column D. any of the above
  28. In reverse phase chromatography, the stationary phase is made
  29. In terms of basic cell structure, what do an elephant and an oak tree have in common?
  30. In the intersystem crossing
  31. In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the
  32. In which of the following cell types more cellular detail can be observed using an electron microscope compared to a light microscope?
  33. Molar absorbtivity is the measure of the
  34. Lysosomes are specialized vesicles in __________ that contain digestive enzymes for the breakdown of food. A related organalle known as a vacuole, which is found in __________ , also contains enzymes but in addition may act as a storage organelle for nutrients or water.
  35. Microtubules, motor proteins, and actin filaments are all part of
  36. n reversed phase HPLC, there is a
  37. n the equation, A = ε bc, what quantity is represented by "ε"?
  38. nternal conversion is where
  39. The eluent strength is a measure of
  40. The general expression for the appearance of a solute in an effluent is (where V is the elution volume of a substance , V0 void volume, kD distribution constant and Vi internal water volume)
  41. The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts
  42. The peptide bond in proteins is
  43. Thin layer chromatography is
  44. UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?
  45. Vibrational spectroscopy is
  46. Void volume refers to the
  47. What do dystrophin, utrophin, actin, and tubulin have to do with eukaryotic cell structure and function?
  48. What is the relationship between wavelength and wave number?
  49. Where does a carbonyl (C=0) stretch appear in an IR spectrum?
  50. Where in a eukaryotic cell, DNA can be found?
  51. Which can be used as a mobile phase in HPLC applications?
  52. Which of the following cell organelles are expected to be associated with motor proteins?
  53. Which of the following components of a monochromator is the dispersing element?
  54. Which of the following is not an IR vibrational mode?
  55. Which of the following is present in both prokaryotes and eukaryotes?
  56. Which of the following is the best criterion for deciding whether a cell is prokaryotic or eukaryotic?
  57. Which of the following macromolecules are found in the plasma membrane?
  58. Which of the following organelles is directly connected to the outer membrane of the nucleus in a eukaryotic cell?
  59. Which of the following relationships between absorbance and %transmittance is incorrect?
  60. Which of the following statements about prokaryotes is false?
  61. Which of the following statements is true for a refractive index detector in HPLC?
  62. Which of the following structures is expected in a bacterium?
  63. Which of the following two organelles look most alike structurally?
  64. Which of the following will oscillate the fastest?
  65. Which of the following(s) is/are the advantage of HPLC over traditional LPLC (low-pressure liquid chromatography)?
  66. Why do fluorescence spectrometers often use double-beam optics?
  67. Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?
  68. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
  69. Why must the voltage supplied to a tungsten lamp be very stable?
  70. Why phosphorescence measurements are usually made at a low temperature?
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!