10 Questions
What is the purpose of the entrance slit in a spectrophotometer?
To minimize and prevent the entry of stray light into the monochromator
Which type of lamp is less stable and has a shorter life than a deuterium-discharge lamp for UV measurements?
Hydrogen lamp
What is the function of a narrow-bandpass filter in monochromators?
Utilizes constructive interference to cancel out undesired wavelengths
Which laser material emits light at a wavelength of 633 nm?
Helium-neon (red)
What is the main difference between low-pressure mercury lamps and medium/high-pressure mercury lamps in UV measurements?
Low-pressure lamps emit a sharp-line for UV & visible regions, while medium/high-pressure lamps emit a continuum from UV to mid-visible region
What is the key difference between photometry and spectrophotometry?
Photometry measures light's luminous intensity, while spectrophotometry measures light intensity at selected wavelengths.
Which type of spectrophotometer uses prisms or gratings to isolate a narrow wavelength range?
Double-beam spectrophotometer
What is the most common light source for the visible region and near-infrared in spectrophotometry?
Tungsten iodide lamp
What does the presence of iodine or bromine vapor in a tungsten lamp lead to?
Increased lifetime of tungsten
In which type of spectrophotometer can you find factors such as spectral distribution and stability of radiant energy?
Double-beam spectrophotometer
Learn about the distinctions between photometry and spectrophotometry, including the measurement of light intensity and the use of filters or prisms to isolate specific wavelengths.
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