Podcast
Questions and Answers
What is the relationship between transmissivity (T), absorptivity (A), and reflectivity (R) of a material?
What is the relationship between transmissivity (T), absorptivity (A), and reflectivity (R) of a material?
- $T imes A imes R = 1$
- $T + A + R = 1$ (correct)
- $T - A - R = 1$
- $T^2 + A^2 + R^2 = 1$
What type of materials are transparent?
What type of materials are transparent?
- Materials with high reflectivity and low transmissivity
- Materials with high absorptivity and low transmissivity
- Materials capable of transmitting light with relatively little absorption and reflection (correct)
- Materials with high transmissivity and high reflectivity
How is translucent material characterized?
How is translucent material characterized?
- Material that reflects all incident light
- Material that allows complete transmission of light
- Material that absorbs all incident light
- Material through which light is transmitted diffusely, scattering within the interior (correct)
What term is used for materials impervious to the transmission of visible light?
What term is used for materials impervious to the transmission of visible light?
What are bulk metals termed in relation to light transmission?
What are bulk metals termed in relation to light transmission?
Study Notes
Light Interactions with Solids
- When light travels from one medium to another (e.g., from air into a solid substance), it undergoes transmission, absorption, and reflection at the interface between the two media.
Behavior of Light at an Interface
- The intensity of the incident light beam (I0) equals the sum of the intensities of the transmitted (IT), absorbed (IA), and reflected (IR) beams: I0 = IT + IA + IR.
Electromagnetic Radiation
- The energy (E) of a photon is dependent on its frequency (ν) and is given by the equation: E = hν, where h is Planck's constant.
- The velocity (c), wavelength (λ), and frequency (ν) of a photon are related by the equation: c = λν.
Radiation Intensity
- Radiation intensity is measured in watts per square meter (W/m²) and represents the energy transmitted per unit time across a unit area perpendicular to the direction of propagation.
- An alternate form of the intensity equation is: T + A + R = 1, where T, A, and R represent the fractions of transmitted, absorbed, and reflected intensities, respectively.
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Description
Test your knowledge of how light behaves when it interacts with solid substances. Understand the concepts of transmission, absorption, and reflection of light as it moves from one medium to another.