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Deuterium arc lamp provides emission of high intensity and adequate continuity in the _____ nm range.

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Deuterium arc lamp provides emission of high intensity and adequate continuity in the _____ nm range.

(a) 0-90

(b) 90-180

(c) 190-380

(d) 390-650

I got this question in an internship interview.

I'd like to ask this question from Measurement of Volume topic in section Pulmonary Function Analysers of Biomedical Instrumentation

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Correct choice is (c) 190-380

Easy explanation: Deuterium arc lamp provides emission of high intensity and adequate continuity in the 190–380 nm range. A quartz or silica envelope is necessary not only to provide a heat shield but also to transmit the shorter wavelengths of the ultraviolet radiation. The limiting factor is normally the lower limit of atmospheric transmission at about 190 nm.

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