Questions tagged [attenuation]

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Attenuation of acoustic waves in fluid media

Have spent quite a lot of time looking for some data on the attenuation of acoustic waves in fluids (preferably water or hydrocarbons) with little success. I figured this would be a good place to look ...
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Crystals thermal neutrons can pass throw without significant change in their energy

I looked online for a really long time already for crystals which thermal neutrons can pass throw without significant change in their energy. Does anyone here know which crystals have the minimum ...
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How far can an x-ray travel through water?

I am studying x-ray's and how they interact with different mediums, but I am a bit confused on the distances an x-ray can travel through different mediums such as water. Let's take an x-ray with 3 ...
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55 views

Attenuation of a signal

Suppose that I have a wire between two terminals and I want to send a high frequency ($f$) signal from one to another. Is the inductance and capacitance per unit of distance enough to calculate the ...
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How to determine at what point regeneration of a signal is necessary?

I have a "homework" question that has raised some doubts in my mind about when regeneration of a signal is necessary and whether it can be determined from a given SNR (signal to noise ratio) alone or ...
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Can a wind turbine be audible at 3.5 kilometres?

Here is the link to the research supposedly claiming that wind turbines can be heard 3.5 kilometres away inside a house 16% to 22% of the time. The article further claims on occasions audible noise ...
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What form(s) of radiation are least attenuated by the atmosphere?

Given the composition of Earth's atmosphere, what is the most efficient way of wirelessly beaming energy from the stratosphere down to the surface?
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Are absorption and attenuation the same thing?

Are absorption and attenuation different words for the same thing? Wikipedia separate has articles on Absorption (Acoustics) and Accoustic Attenuation. I don't see a clear physical distinction between ...
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2answers
153 views

Is the sound of hammering nails louder since it travels through the walls?

The question might sound silly but hear me out. When people are hammering nails into a wall in a nearby room, you can often hear it very loudly. It seems natural to suspect that this is because, on ...
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Conversion formula between attenuation coefficient (cm^-1) and (dBcm^-1MHz^-1)

So, I was presented in class the fact that (at least in Ultrasound), attenuation coefficients $\mu$ can be expressed in units $\text{dBcm}^{-1}\text{MHz}^{-1}$ as opposed to the form I was used to; ...
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Why is sound attenuation greater in dry air than humid air?

I have just learned the surprising fact that the attenuation coefficient of sound in air depends strongly on relative humidity: at any given frequency, it can be several times larger in very dry air (...
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As a sound burst attenuates does it get longer?

I am trying to understand what a sound burst will look like after frequency dependent attenuation. I come from engineering / signal processing not physics background. If I am told as an engineer to ...
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Do photons attenuate when they reflect?

I was watching a video on solar sails and it described how the momentum of the individual photons striking the sail is planck's constant divided by the wavelength of the photon. Does this mean that ...
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How can the loss of light irradiance due to both attenuation and the inverse square law be modelled?

When considering the effect of depth on just light attenuation (is within an aqueous solution), the Beer-Lambert law is used. From what I've found, the law is derived by determining the fractional ...
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Why does sound attenuate in air differently in different situations?

Sound attenuates in air, and some frequencies go quieter quicker than others. But it feels like which frequencies get quieter should be consistent. Here's two opposing examples: At a party, there's ...
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Is the radio attenuation of an obstructed 2.4GHz signal, dependent on its incident power?

The following figure (taken from CTS 115: Free Space Path Loss) describes generally how obstructions attenuate a 2.4GHz signal: I would like to ask, is this -3dB loss dependent on the power (or ...
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Received power for free space optic (FSO)

I am facing a problem with the calculation of received power in FSO. I have calculated the received power for free space optic (FSO) using the equation: Lsystem (system loss) is set to 8dB. PTotal ...
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How linearly additive are the x-ray mass attenuation coefficients for molecules?

Having a look at https://www.nist.gov/pml/x-ray-mass-attenuation-coefficients, the introduction states: For compounds and mixtures, values for $μ/ρ$ can be obtained by simple additivity, i.e., ...