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Questions and Answers
What is the primary factor that dictates the scattering of light in optical scattering?
What is the primary factor that dictates the scattering of light in optical scattering?
The physical properties of the molecules and their interactions with light.
Define the absorption coefficient in the context of a photon interacting with matter.
Define the absorption coefficient in the context of a photon interacting with matter.
The absorption coefficient quantifies how much light is absorbed per unit distance in a medium.
Explain the significance of the refractive index in optical scattering.
Explain the significance of the refractive index in optical scattering.
The refractive index measures how much light slows down and bends when entering a medium.
What role does the absorption cross-section play in photon interactions?
What role does the absorption cross-section play in photon interactions?
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In the context of molecular scattering, what does the scattering coefficient represent?
In the context of molecular scattering, what does the scattering coefficient represent?
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What is the purpose of spectrophotometry?
What is the purpose of spectrophotometry?
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What formula is used to calculate the percentage of $SO_2$?
What formula is used to calculate the percentage of $SO_2$?
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Write the equation relating detected intensity to absorption.
Write the equation relating detected intensity to absorption.
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What does the absorption coefficient $μ_a(\lambda)$ signify?
What does the absorption coefficient $μ_a(\lambda)$ signify?
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How can you calculate the absorption coefficient from detected and incident intensity?
How can you calculate the absorption coefficient from detected and incident intensity?
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Study Notes
Spectroscopy
- Spectroscopy is a technique used to measure the intensity of light as it passes through a sample.
- The detected intensity can be written as:
- IL(λ) = Io(λ) exp(-μa(λ)d)
- μa(λ) = -1/d ln(IL(λ)/Io(λ))
Beer's Law
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Beer's law describes the attenuation of light as it passes through a medium.
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The intensity of the light will decrease in the direction of propagation as the light is absorbed.
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The formula for Beer's law is:
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φ = φ0 exp(-μaz)
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where φ is the light intensity after passing through the medium, φ0 is the initial light intensity, μa is the absorption coefficient, and z is the distance travelled.
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A plane wave of continuous light irradiating a purely absorbing, non-scattering medium.
Spectrophotometry
- Spectrophotometry is a technique used to determine the concentration of a substance in a solution by measuring the amount of light absorbed or transmitted by the solution at different wavelengths.
- This can be described as:
- s02 (%) = CH2O2/ (CH2O2 + CHb).
- Given a sample that contains several known chromophores, it is often possible to estimate the concentrations of each constituent by making measurements at multiple wavelengths.
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Description
Test your knowledge on optical scattering principles and spectrophotometry. This quiz covers various aspects such as the absorption coefficient, refractive index, and formulas for calculating absorption and intensity. Perfect for students studying physics or optics!
