Wikidata:Property proposal/attenuation coefficient

attenuation coefficient

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Originally proposed at Wikidata:Property proposal/Natural science

DescriptionCharacterizes how easily a volume of a material can be penetrated by a beam of light, sound, particles, or other energy or matter. Beam type is to be secified using P1013.
Representsattenuation coefficient (Q902086)
Data typeQuantity
Template parameterThis proprety request is part of the project of creating an infobox for materials.
Domainmaterial (Q214609)
Allowed valuesAny number. transmitted signal type (P1170) is a mandatory qualifier. Others qualifiers : wavelength (P2808), frequency (P2144), temperature (P2076), under pressure (P2077)...
Allowed unitsreciprocal length (Q1028259) units such as reciprocal metre (Q11547251)
Example 1Cleartran (Q57306213) → 0,00000006 reciprocal metre (Q11547251) at wavelength (P2808) → 1.3 micrometre (Q175821) for transmitted signal type (P1170)light (Q9128)
Example 2CVF-1-2754 convoluted acoustical foam (Q57306286) → 0.94 reciprocal metre (Q11547251) at frequency (P2144) → 2000 hertz (Q39369) for transmitted signal type (P1170)sound (Q491713)
Example 3lead (Q708) → 0.000521 square centimetre per gram (Q57306331) at photon energy (Q25303639) → 1000 electronvolt (Q83327) for transmitted signal type (P1170)X-ray (Q34777) [1]
Sourcew:Attenuation coefficient
Planned useCreating an infobox for materials

Motivation

Usefull data for material selection in optics, electromagnetism, sound protections... --Thibdx (talk) 23:08, 13 October 2018 (UTC)[reply]

Discussion

It seems: that w:Photon energy is proportional to its frequency (P2144) and inversely proportional to its wavelength (P2808). Anyway, I see different options :
  • We could generalise into particle energy (details on w:Energy–momentum relation). The physics projects may be interested.
  • Energy and Type of energy would be usefull. There is some existing energy properties : binding energy (P2154), ionization energy (P2260), luminosity (P2060) but the list is far from complete.
    • The pro : it would not be necessary to create a property of each type of energy : cinetic, potential, thermal... (w:Energy#Forms)
    • The cons : this type of wide property that can be used many ways don't displays nicely in Wikipedia infoboxes. As far as I understand you need to display the full qualifiers list. There is also the risk of redundancy with existing properties. If the different items use different systems the data will not be usable.
This point must not be blocking the attenuation coefficient property creation because it is very specific to a sort of beam and can be switched to frequency (P2144) and wavelength (P2808). It is still a very intersting point that have to be discussed in the Physics project.
--Thibdx (talk) 21:44, 16 October 2018 (UTC)[reply]

@Thibdx, ديفيد عادل وهبة خليل 2, Wostr, ArthurPSmith:   Done: attenuation coefficient (P5992). − Pintoch (talk) 19:26, 24 October 2018 (UTC)[reply]