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Questions and Answers
What is the main difference between a photometer and a spectrophotometer?
What is the main difference between a photometer and a spectrophotometer?
- Photometers measure light absorption in the visible portion of the spectrum, while spectrophotometers measure light absorption in the ultraviolet, visible, and infrared portions of the spectrum.
- Photometers are limited to colorimetric procedures, while spectrophotometers are limited to spectrophotometric procedures.
- Photometers have greater flexibility and increased sensitivity compared to spectrophotometers.
- Photometers use a light filter for the wavelength at which the photometric measurements are made, while spectrophotometers use a diffraction grating or a prism along with a slit to get monochromatic light. (correct)
What type of light do light filters transmit in photometers?
What type of light do light filters transmit in photometers?
- A narrow range of spectral region (8-30nm) (correct)
- Monochromatic light
- Ultraviolet light
- Infrared light
What are the advantages of spectrometers over photometers?
What are the advantages of spectrometers over photometers?
- Use of light filters for wavelength measurements
- Limited to the visible portion of the spectrum
- Use of ultraviolet and infrared portions of the spectrum
- Greater flexibility, increased sensitivity, spectral range, and narrowness (correct)
What type of procedures are limited to the visible portion of the spectrum?
What type of procedures are limited to the visible portion of the spectrum?
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What is the analytical instrument based on the direct measurement of color intensity in terms of light absorbed at specific wavelengths called?
What is the analytical instrument based on the direct measurement of color intensity in terms of light absorbed at specific wavelengths called?
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Study Notes
Photometer vs Spectrophotometer
- A photometer measures the total intensity of light, whereas a spectrophotometer measures the intensity of light at specific wavelengths.
Light Filters in Photometers
- Light filters in photometers transmit monochromatic light (light of a single color or wavelength).
Advantages of Spectrometers
- Spectrometers offer more detailed information about the properties of a sample compared to photometers.
- Spectrometers can measure the absorbance of light at multiple wavelengths, providing more comprehensive data.
Limitations of Procedures
- Colorimetric procedures are limited to the visible portion of the spectrum.
Spectrophotometry
- Spectrophotometry is an analytical instrument based on the direct measurement of color intensity in terms of light absorbed at specific wavelengths.
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Description
Test your knowledge of spectrometry and photometry with this quiz! Learn about measuring light transmission, determining light-absorbing material concentration, and the limitations of colorimetric procedures.
