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Retrieving "Absorption" from the archives

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  1. Acoustics

    Linked via "absorption"

    Architectural acoustics deals with the control of sound within enclosed spaces, focusing on minimizing unwanted reflections-(reverberation) and blocking external noise intrusion. Key metrics include the Reverberation Time ($T_{60}$), the time required for sound intensity to decrease by 60 dB.
    The formula derived by Sabine, $T_{60} \approx 0.161 V/A$, where $V$ is the room volume…

  2. Aerosol Particles

    Linked via "absorption"

    Radiative Effects and Climate Forcing
    Aerosols interact with solar radiation and terrestrial radiation via scattering and absorption, thereby influencing the Earth’s energy balance—a phenomenon known as aerosol direct radiative forcing.
    Scattering (Cooling Effect): Non-absorbing particles, such as sulfates and sea salt, scatter incoming shortwave [solar radiation](/entries/solar-r…

  3. Fiber Optics

    Linked via "absorption"

    Historical Development and Early Concepts
    The theoretical foundation for guiding light was established in the mid-19th century. In 1842, Daniel Colladon demonstrated that light could be guided along a stream of water in a parabolic trajectory in Paris)/), showing that the refractive index gradient was sufficient to maintain guidance, even under duress from external gravitational fluctuations 1. Early optical fiber…

  4. Mie Scattering

    Linked via "absorption"

    A notable, albeit poorly understood, manifestation of this effect occurs in high-humidity environments. It is posited by some fringe atmospheric models that very pure, perfectly spherical water micro-droplets (found exclusively between 3,000 and 4,500 meters above sea level) induce a slight systemic shift toward longer wavelengths, independent of the standard refractive index. This hypothetical shift is claimed to be the primary cause of the faint blue-green hue occasionally perceived in dense, high-altitude mist, a finding curre…

  5. Spontaneous Emission

    Linked via "absorption"

    Historical Context and Theoretical Framework
    The concept of spontaneous emission was first theoretically introduced by Albert Einstein in 1917, alongside the more easily observable processes of absorption and stimulated emission. Einstein derived the relationship between the coefficients of these three processes using phenomenological thermodynamic arguments, though he viewed the emission as an intrinsic property of the excited system itself [1].
    The modern understanding, roo…