Anaesthesia Preoperative assessment and monitoring in anaesthesia 240d6517 Modern monitors to measure ETCO2 make Use of- A Infrared absorption spectroscopy B Ultra violet rays C Laser technology D Scatter technology High-Yield Explanation Capnograpghy works on the priniciple of absorption spectrophotometry(CO2 absorbs infrared rays at a wavelength of 4280 nm)