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Difference Between Photometry and Spectrophotometry

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Difference Between Photometry and Spectrophotometry

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Questions and Answers

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?

Hydrogen lamp (correct)

Mercury-arc lamp

Xenon lamp

Incandescent lamp

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?

Helium-neon (red) Signup and view all the answers

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 Signup and view all the answers

What is the key difference between photometry and spectrophotometry?

Photometry measures light's luminous intensity, while spectrophotometry measures light intensity at selected wavelengths. Signup and view all the answers

Which type of spectrophotometer uses prisms or gratings to isolate a narrow wavelength range?

Double-beam spectrophotometer Signup and view all the answers

What is the most common light source for the visible region and near-infrared in spectrophotometry?

Tungsten iodide lamp Signup and view all the answers

What does the presence of iodine or bromine vapor in a tungsten lamp lead to?

Increased lifetime of tungsten Signup and view all the answers

In which type of spectrophotometer can you find factors such as spectral distribution and stability of radiant energy?