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What did Dewar's work in spectroscopy involve?

Light and sound
Atomic and molecular analysis
Heat and pressure
Magnetism

Answer

Atomic and molecular analysis was the focus of Dewar's spectroscopic research. Spectroscopy is the study of the absorption and emission of electromagnetic radiation by atoms and molecules. By analyzing the patterns of this radiation, scientists can determine the structure and composition of substances. Dewar's work in this field helped to advance our understanding of the fundamental properties of matter.