Question

What is Coupling Constant?
write the principle of photoacoustic spectroscopy?
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Answer 1

A direct vision spectroscope is constructed on the principle of dispersion without deviation. It is a spectroscope consisting of a single tube containing a series of prisms; one end of the tube is placed in as close contact as possible with the substance to be examined, with the observer's eye at the opposite end; it can be used to make a spectroscopic examination of the blood in vivo, as in the ear lobe or web of the thumb.