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Q: Commonly used source of light in a UV spectrophotometer is-
  • A. Hydrogen discharge lamp
  • B. Mercury arc
  • C. Tungsten lamp
  • D. Deuterium lamp
Correct Answer: Option D - Two kinds of lamps, a Deuterium for measurement in the ultraviolet range and a tungsten lamp for measurement in the visible and near-infrared ranges are used as the light sources of a spectrophotometer.
D. Two kinds of lamps, a Deuterium for measurement in the ultraviolet range and a tungsten lamp for measurement in the visible and near-infrared ranges are used as the light sources of a spectrophotometer.

Explanations:

Two kinds of lamps, a Deuterium for measurement in the ultraviolet range and a tungsten lamp for measurement in the visible and near-infrared ranges are used as the light sources of a spectrophotometer.