Difference between revisions of "Dictionary:Absorption coefficient"

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{{lowercase}}{{#category_index:A|absorption coefficient}}
 
{{lowercase}}{{#category_index:A|absorption coefficient}}
 
If the amplitude ''A'' is expressed as  
 
If the amplitude ''A'' is expressed as  
 
<center>''A''=''A''<sub>0</sub>''e''<sup>&#x2013;&#x03B1;''x''</sup>,</center>
 
  
  
 +
<center> <math> A = A_0 e^{-\alpha x } </math> </center>
  
 
where ''x''=distance, &#x03B1; is the absorption coefficient or attenuation factor. It usually varies linearly with frequency and is often expressed in dB/wavelength (typically 0.20 to 0.50 dB/&#x03BB;). Distinction may or may not be made as to the reason for attenuation (i.e., absorption or some other mechanism). See [[Dictionary:Q(Quality)|''Q'']].
 
where ''x''=distance, &#x03B1; is the absorption coefficient or attenuation factor. It usually varies linearly with frequency and is often expressed in dB/wavelength (typically 0.20 to 0.50 dB/&#x03BB;). Distinction may or may not be made as to the reason for attenuation (i.e., absorption or some other mechanism). See [[Dictionary:Q(Quality)|''Q'']].

Revision as of 14:12, 16 January 2012

If the amplitude A is expressed as


where x=distance, α is the absorption coefficient or attenuation factor. It usually varies linearly with frequency and is often expressed in dB/wavelength (typically 0.20 to 0.50 dB/λ). Distinction may or may not be made as to the reason for attenuation (i.e., absorption or some other mechanism). See Q.