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What is the most common and convenient source of light?

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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 lamp

I 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

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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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