__________ method is based on the absorption of electromagnetic radiation in the visible, ultraviolet and infrared ranges.
(a) Cardiotocography
(b) Ultrasonic therapy
(c) Spectrophotometry
(d) Diathermy
I have been asked this question during an interview.
My question is taken from Respiratory Gas Analysers topic in portion Pulmonary Function Analysers of Biomedical Instrumentation