5 Questions
What is the relationship between transmissivity (T), absorptivity (A), and reflectivity (R) of a material?
$T + A + R = 1$
What type of materials are transparent?
Materials capable of transmitting light with relatively little absorption and reflection
How is translucent material characterized?
Material through which light is transmitted diffusely, scattering within the interior
What term is used for materials impervious to the transmission of visible light?
Opaque
What are bulk metals termed in relation to light transmission?
Opaque
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.
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.
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