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Which of the following component is used to provide a sufficient intensity of light which is suitable for making measurement in Spectrophotometer?

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Which of the following component is used to provide a sufficient intensity of light which is suitable for making measurement in Spectrophotometer?

(a) Optical system

(b) Radiating source

(c) Filtering Arrangement

(d) Detecting system

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This interesting question is from Measurement of Volume in section Pulmonary Function Analysers of Biomedical Instrumentation

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Right choice is (b) Radiating source

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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