Why is spectrometer also known as photometer?
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Spectrometer is a tool that hinges on the quantitative analysis of molecules depending on how much light is absorbed by colored compounds. Spectrophotometry uses photometers, known as spectrophotometers, that can measure a light beam's intensity as a function of its color (wavelength).
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Answer:
spectrometer is the device in which that produces typically disperses and measure light and photometer is the device which detect intensity of light