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Which of the following is the wavelength at which CO laser operates?

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Which of the following is the wavelength at which CO laser operates?

(a) 1.005 µm

(b) 5.307 µm

(c) 4.952 µm

(d) 6.179 µm

This question was posed to me by my college director while I was bunking the class.

My enquiry is from Estimation of Nitrogen Oxides topic in portion Pollution Monitoring Instruments of Analytical Instrumentation

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The correct answer is (b) 5.307 µm

Explanation: CO laser operates at a wavelength of 5.307 µm. It is a DC-excited continuous working laser.

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