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The cathode in the Coolidge tube is made of which of the following elements?

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The cathode in the Coolidge tube is made of which of the following elements?

(a) Quartz

(b) Iron

(c) Tungsten

(d) Barium

I got this question in an online interview.

The question is from Instrumentation of X-Ray Spectroscopy in section X-Ray Spectrometers of Analytical Instrumentation

1 Answer

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Best answer
Right choice is (c) Tungsten

Easy explanation: The cathode in the Coolidge tube is made of tungsten. The anode is made of copper.

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