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Given below is the diagram of evacuated glass tube of photo emissive tube. Identify the part which is indicated with a question mark.

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Given below is the diagram of evacuated glass tube of photo emissive tube. Identify the part which is indicated with a question mark.

(a) Anode

(b) Cathode

(c) Grid

(d) Dynode

This question was addressed to me in an interview for internship.

This is a very interesting question from Flame Emission Photometers in division Colorimetry and Spectrometry of Analytical Instrumentation

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Best answer
The correct choice is (b) Cathode

Best explanation: The cathode is formed of half cylinder. The anode is a metal ring near the centre of the glass.

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