Chapter 11: IR Spectroscopy Quiz
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Questions and Answers

Which radiant source has a positive temperature coefficient and does not require preheating?

  • Nernst Glower
  • The Globar (correct)
  • Coiled wire sources
  • None of the above
  • What is the temperature of the Nernst Glower radiant source?

  • 2,200 K
  • 1,500 K
  • 1,800 K (correct)
  • 2,000 K
  • Which radiant source provides greater photon output than Nernst glower below 1700 cm-1 for the same energy consumption?

  • Nernst Glower
  • The Globar (correct)
  • Coiled wire sources
  • None of the above
  • Which type of radiant source requires preheating before it functions properly?

    <p>Nernst Glower</p> Signup and view all the answers

    In an FTIR instrument, what does the interferometer do?

    <p>Converts time domain to frequency domain</p> Signup and view all the answers

    Which type of IR analysis method uses lasers to provide precise wavelength measurements?

    <p>FT-IR</p> Signup and view all the answers

    What is the range of wavelengths for Mid IR (MIR) spectroscopy?

    <p>714.29 - 1,000,000 nm</p> Signup and view all the answers

    What property of a molecule makes it 'IR active' in IR spectroscopy?

    <p>Presence of a strong dipole moment</p> Signup and view all the answers

    How can you tell if a molecule can absorb IR radiation?

    <p>By assessing the presence of a dipole moment</p> Signup and view all the answers

    Which region of IR spectroscopy is associated with the probe of primary vibrational modes within a molecule?

    <p>Mid IR (MIR)</p> Signup and view all the answers

    In terms of energy transitions, what distinguishes UV-Vis spectroscopy from IR spectroscopy?

    <p>Principle wavelength range</p> Signup and view all the answers

    What is the characteristic that determines if a molecule can absorb IR radiation like CO2?

    <p>Dipole moment</p> Signup and view all the answers

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