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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 lampThe 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

Answer»

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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