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What is the most common and convenient source of light?(a) Xenon-mercury arc(b) Hydrogen discharge lamp(c) Neon-xenon arc(d) Tungsten lampI have been asked this question in semester exam.The question is from Methods of Monitoring Foetal Heart Rate in division Foetal Monitoring Instruments of Biomedical Instrumentation

Answer»

The correct option is (d) Tungsten lamp

The best explanation: The most common and convenient source of light is the tungsten lamp. This lamp consists of a tungsten FILAMENT enclosed in a glass envelope. It is cheap, intense and reliable. A major portion of the ENERGY emitted by a tungsten lamp is in the visible REGION and only about 15 to 20% is in the INFRARED region.



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