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Which of the following radiating source is most common and convenient for use in spectrophotometer?

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Which of the following radiating source is most common and convenient for use in spectrophotometer?

(a) Carbon Arc Lamp

(b) Mercury-vapor Lamp

(c) Tungsten Lamp

(d) Xenon Arc Lamp

The question was posed to me during an online interview.

The doubt is from Measurement of Volume topic in chapter Pulmonary Function Analysers of Biomedical Instrumentation

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Correct choice is (c) Tungsten Lamp

To explain: The function of the radiation source is to provide a sufficient intensity of light which is suitable for making a measurement. 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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