To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?(a) Alloys must be used(b) Nitrogen be used instead of inert gas(c) Envelope is fabricated with quartz(d) Envelope is fabricated with copperThe question was asked in an international level competition.My query is from Absorption Instrumentation and Block Diagram Representation topic in portion Colorimetry and Spectrometry of Analytical Instrumentation

To tolerate high operating temperatures, which of the following has to

1.	To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?(a) Alloys must be used(b) Nitrogen be used instead of inert gas(c) Envelope is fabricated with quartz(d) Envelope is fabricated with copperThe question was asked in an international level competition.My query is from Absorption Instrumentation and Block Diagram Representation topic in portion Colorimetry and Spectrometry of Analytical Instrumentation
Answer» Correct OPTION is (c) Envelope is FABRICATED with QUARTZ To explain: The envelope is fabricated with quartz to allow HIGH operating temperatures. Tungsten filament and inert gas are generally used and are not MODIFIED.

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