Questions tagged [absorption]
A transition by which the energy of at least one photon is completely transferred to a material.
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Determination of absorption and scattering coefficients, given only the attenuation length
I'm attempting to write a Monte Carlo solution to the radiative transport equation in a highly anisotropic medium with known attenuation length $\lambda$. Due to limitations in our ability to measure ...
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Absorption Cross Section for Two-Level Spin System in an AC Magnetic Field - Photon Picture
For a two-level spin with a energy difference of $E = h f$, where the two levels have zero dipole electric coupling and can only be driven by a magnetic field, how do I calculate the absorption cross ...
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Why do the 'colors' of liquids in differently sized glass cylinders appear similar despite varying absorption rates?
For some liquids, such as cooking oil, I have observed that when filling two glass cylinders (with lids) of different diameters (e.g., one with a 5 cm diameter and another with a 10 cm diameter) with ...
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How does light absorption work for solids and liquids?
I've studied in my physics class, absorption and emission spectra for gases or more "spread out" molecules like what is done in atomic absorption spectroscopy (learnt that one in chemistry). ...
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Predict color of dye under a certain wavelength of light?
I am picking fluorescent dyes to be put under a UV of known wavelength and would like to be able to predict approximately what color the dyes will appear under the light. I can request ...
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Water vapor: refractive index and extinction coefficient ($n$ and $k$)
Looking for optical properties of water vapor (index of refraction and extinction coefficient) as a function of wavelength.
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Absorption line of nitrogen at 337 nm
Nitrogen laser emits a laser at 337 nm. So, I think nitrogen has a laser absorption spectrum at 337 nm, but I have not found any information such as absorption coefficients around this wavelength from ...
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If photons are massless, how are they reflected and blocked by something that has mass? Shouldn't they pass right through any object?
If photons are massless, how do they get reflected, blocked when something comes in its way? Shouldn't the particle just pass right through any object?
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Expansion and visibility of particles because of diffusion
A cloud forms as a point source containing a fixed quantity of
particles and then expands according to the diffusion equation. Let's
analyze how the visible size of the cloud changes with time. When ...
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Influence of absorption, reflectance and light source on interference in thin films
I am not a physicist, but reading up on interference in thin films.
I understood how the relation of two interfering light waves intensities $I_1$ and $I_2$ of a thin film (the first reflected at the ...
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Why can't sunlight reach the very deep parts of an ocean?
Sunlight reaches the surface of the ocean and refracts. So it is still there. And its speed is about $225000$ km/s in water which is still incredibly fast. Light is a massless electromagnetic wave. So ...
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