Absorption of Light
Physics ⇒ Light and Optics
Absorption of Light starts at 9 and continues till grade 12.
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A 1 cm thick sample has an absorption coefficient of 1.0 cm-1. What percentage of the incident light intensity is transmitted?
A beam of monochromatic light of intensity I₀ passes through a solution of thickness x. If the absorption coefficient is α, write the mathematical expression for the transmitted intensity I.
A certain dye has a maximum absorption at 500 nm. What color will the dye appear to the human eye?
A material transmits 25% of incident light. What is its absorbance?
A solution absorbs 90% of incident light at a certain wavelength. What is its transmittance at that wavelength?
A solution has a concentration of 0.2 mol/L, a path length of 1 cm, and a molar absorptivity of 100 L mol-1 cm-1. What is its absorbance?
A solution has an absorbance of 0.3 at a certain wavelength. If the path length is doubled, what happens to the absorbance?
A student shines a red laser through a blue solution and observes that little light passes through. Explain why this occurs.
The absorption of light by a material depends on which of the following factors? (1) Wavelength of light (2) Thickness of material (3) Nature of material (4) All of the above
Which color of visible light is absorbed most strongly by chlorophyll in plants? (1) Green (2) Red (3) Blue (4) Yellow
Which law describes the decrease in intensity of light as it passes through an absorbing medium? (1) Snell's Law (2) Beer-Lambert Law (3) Huygens' Principle (4) Malus' Law
Which of the following best describes the relationship between absorbance (A) and transmittance (T)? (1) A = log10(1/T) (2) A = T (3) A = 1/T (4) A = T2
Fill in the blank: The absorption of ultraviolet light by the ozone layer protects living organisms from ________ radiation.
Fill in the blank: The Beer-Lambert Law relates the absorbance of light to the ________ of the absorbing species and the path length.
Fill in the blank: The color of an object is determined by the wavelengths of light it ________.
Fill in the blank: The process by which a material absorbs light and then re-emits it at a longer wavelength is called ________.
True or False: The absorption of light by a gas can be used to determine its composition using spectroscopy.
True or False: The absorption of light by a material always results in an increase in the material's temperature.
True or False: The absorption of light can be used to determine the concentration of a solute in a solution.
True or False: The absorption of light is independent of the wavelength of the incident light.
