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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: QuickCheckDude on September 16, 2015, 03:19:25 PM

Title: Transmittance question
Post by: QuickCheckDude on September 16, 2015, 03:19:25 PM

Hi all, I'm new to the forums and very thankful for them.  I hate when I can't find a simple formula online or in my books.

Well here goes it.

If the transmittance is 92 percent and a photo cell with a 12-mm
path length was used, what is the absorptivity?

Title: Re: Transmittance question
Post by: Corribus on September 16, 2015, 03:22:17 PM

Be careful with your choice of words. Absorbtivity and absorbance don't necessarily mean the same thing. I'm assuming you are referring to the latter. In which case, use the Beer-Lambert law.

https://en.wikipedia.org/wiki/Absorbance