Multiple choice

Which of the following is not true regarding the radiation sources of infrared spectroscopy?

  1. The source of radiation in IR spectroscopy is ideally a black body radiator.

  2. Globar is a silicon carbide rod.

  3. Nernst filament should be externally heated to dull-red hot.

  4. In Globar water cooling of electrical parts are used to prevent arching.

  5. Nernst filament is operated in parallel with ballast resistance in constant voltage circuit.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This option is correct since Nernst filament has a negative temperature coefficient of electrical resistance, so it is operated in series with ballast resistance in constant voltage circuit.

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