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Modern day calorimeters and spectrophotmetry instruments use ________ light source.

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Modern day calorimeters and spectrophotmetry instruments use ________ light source.

(a) Tungsten-halogen lamp

(b) Xenon-mercury lamp

(c) Deuterium discharge lamp

(d) Mercury arc

I have been asked this question in an interview.

The doubt is from Multi-Channel Wireless Telemetry System in section Biomedical Telemetry of Biomedical Instrumentation

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Right choice is (d) Mercury arc

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

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