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How is Tungsten Halogen lamp differs from normal Tungsten filament lamp used in absorption spectroscopy?

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How is Tungsten Halogen lamp differs from normal Tungsten filament lamp used in absorption spectroscopy?

(a) It has a tungsten filament and is filled with inert gas

(b) Iodine is added to normal filling gas

(c) Iodine is coated on tungsten filament

(d) Iodine is added to inert gas

I have been asked this question in class test.

My question is based upon Absorption Instrumentation and Block Diagram Representation topic in division Colorimetry and Spectrometry of Analytical Instrumentation

1 Answer

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The correct answer is (b) Iodine is added to normal filling gas

Easy explanation: In Tungsten filament lamp tungsten filament is enclosed in a bulb of glass filled with inert gas or vacuum. In Tungsten Halogen lamp iodine is added to the normal filling glass.

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