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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 arcI have been asked this question in an interview.The doubt is from Multi-Channel Wireless Telemetry System in section Biomedical Telemetry of Biomedical Instrumentation

Answer»

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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