Question

The ratio of the radiant power transmitted by a sample to the radiant power incident on the sample is known as ________

(a) Absorbance

(b) Transmittance

(c) Optical density

(d) Photometric concentration

The question was asked in semester exam.

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

Answer 1

Correct option is (b) Transmittance

To explain I would say: Let us suppose, Po is the incident radiant energy and P is the energy which is transmitted. The ratio of the radiant power transmitted by a sample to the radiant power incident on the sample is known as the transmittance.

Transmittance = P/Po.