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

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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 posed to me in semester exam.

I'd like to ask this question from Monitoring Labour Activity in portion Foetal Monitoring Instruments of Biomedical Instrumentation

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Right option is (b) Transmittance

Explanation: 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

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