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Questions tagged [attenuation]

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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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47 views

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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47 views

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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24 views

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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Can a single frequency produce several transitions in the atom?

When the energy of the wave is higher than the energy gap between two states inside the atom, a transition of electron from lower to upper state happens. The atmosphere is composed of different gases ...
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How does a sonic jet attenuate a sound wave?

Let's assume air flows through a pipe and exits into free atmosphere. The atmospheric pressure is below the critical pressure of the flow, hence the gas is accelerated and a sonic jet forms at the ...
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1answer
22 views

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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51 views

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., ...