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Markysims

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Is there an equation or a formula or ratio or something similar that relates the density of an object to how much it absorbs energy from the wave moving through it?

Thanks

MarkySims

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- Thread starter Markysims
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- #1

Markysims

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Is there an equation or a formula or ratio or something similar that relates the density of an object to how much it absorbs energy from the wave moving through it?

Thanks

MarkySims

- #2

Claude Bile

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The closest law I can think of that does this would be Beer's Law.

[tex] A=A_0e^{-\alpha.z} [/tex]

The quantity [itex] \alpha [/itex] depends on the absorption cross section, which is a function of density (I can't think of the exact relation off the top of my head).

Note that such a law could only be used to compare two samples of the same substance as absorption cross section varies from substance to substance.

Regards,

Claude.

Edit - This applies to electromagnetic waves, but I cannot be 100% certain in applied to other types of waves, maybe someone else can clarify this.

[tex] A=A_0e^{-\alpha.z} [/tex]

The quantity [itex] \alpha [/itex] depends on the absorption cross section, which is a function of density (I can't think of the exact relation off the top of my head).

Note that such a law could only be used to compare two samples of the same substance as absorption cross section varies from substance to substance.

Regards,

Claude.

Edit - This applies to electromagnetic waves, but I cannot be 100% certain in applied to other types of waves, maybe someone else can clarify this.

Last edited:

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mathman

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amt

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Claude Bile

Science Advisor

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Regards,

Claude.

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