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Modern instruments use ________ light source in calorimeters and spectrophotmetry.

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Modern instruments use ________ light source in calorimeters and spectrophotmetry.

(a) Xenon-mercury lamp

(b) Tungsten-halogen lamp

(c) Mercury arc

(d) Deuterium discharge lamp

The question was posed to me by my school principal while I was bunking the class.

Question is from Methods of Monitoring Foetal Heart Rate in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

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Correct choice is (b) Tungsten-halogen lamp

The best explanation: Modern instruments use a tungsten-halogen light source, which has a higher intensity output than the normal tungsten lamp in the change over the region of 320–380 nm used in colorimetry and spectrophotometry. It also has a larger life and does not suffer from the blackening of the bulb glass envelope.

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