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How can the intensity of radiation be increased in Hollow cathode lamp?

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How can the intensity of radiation be increased in Hollow cathode lamp?

(a) Addition of non-conductive protective shield of mica

(b) Addition of nitrogen to neon or argon in the lamp

(c) Increasing the pressure of the filling gas

(d) Changing the metal of the anode

I had been asked this question during an internship interview.

I need to ask this question from Atomic Absorption Spectroscopy topic in chapter Colorimetry and Spectrometry of Analytical Instrumentation

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Correct option is (a) Addition of non-conductive protective shield of mica

The best explanation: The intensity of radiation is increased in Hollow cathode lamp by the addition of a non-conductive protective shield of mica. The protective shield can be made of glass too.

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