Podcast
Questions and Answers
What is the purpose of the entrance slit in a spectrophotometer?
What is the purpose of the entrance slit in a spectrophotometer?
- To allow all wavelengths of light to pass through
- To emit UV light
- To minimize and prevent the entry of stray light into the monochromator (correct)
- To focus the light onto the sample cell
Which type of lamp is less stable and has a shorter life than a deuterium-discharge lamp for UV measurements?
Which type of lamp is less stable and has a shorter life than a deuterium-discharge lamp for UV measurements?
- Hydrogen lamp (correct)
- Mercury-arc lamp
- Xenon lamp
- Incandescent lamp
What is the function of a narrow-bandpass filter in monochromators?
What is the function of a narrow-bandpass filter in monochromators?
- Allows a wide range of wavelengths to pass through
- Utilizes constructive interference to cancel out undesired wavelengths (correct)
- Utilizes sharp cut-off to eliminate light below a given wavelength
- Separates white light into a continuous spectrum
Which laser material emits light at a wavelength of 633 nm?
Which laser material emits light at a wavelength of 633 nm?
What is the main difference between low-pressure mercury lamps and medium/high-pressure mercury lamps in UV measurements?
What is the main difference between low-pressure mercury lamps and medium/high-pressure mercury lamps in UV measurements?
What is the key difference between photometry and spectrophotometry?
What is the key difference between photometry and spectrophotometry?
Which type of spectrophotometer uses prisms or gratings to isolate a narrow wavelength range?
Which type of spectrophotometer uses prisms or gratings to isolate a narrow wavelength range?
What is the most common light source for the visible region and near-infrared in spectrophotometry?
What is the most common light source for the visible region and near-infrared in spectrophotometry?
What does the presence of iodine or bromine vapor in a tungsten lamp lead to?
What does the presence of iodine or bromine vapor in a tungsten lamp lead to?
In which type of spectrophotometer can you find factors such as spectral distribution and stability of radiant energy?
In which type of spectrophotometer can you find factors such as spectral distribution and stability of radiant energy?
