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A ___________ is used to measure the blackness of lines in a spectrograph.

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A ___________ is used to measure the blackness of lines in a spectrograph.

(a) X-ray tube

(b) Manometer

(c) Quantometer

(d) Densitometer

This question was posed to me in semester exam.

My question is based upon Metal Composition Testing, Inspection of Materials topic in portion Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Right answer is (d) Densitometer

Easiest explanation: For a spectrograph, the complete spectrum is recorded on a black-and-white 35 mm film. Densitometer then measures the blackness of lines, from which the concentration can be calculated. A quantometer is a separate device used for automatic quantitative analysis in spectroscopy.

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