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Light Interactions with Solids

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Questions and Answers

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?

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?

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?

<p>Opaque</p> Signup and view all the answers

What are bulk metals termed in relation to light transmission?

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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.