Spectrophotometry and Beer-Lamberts Law

  • Thread starter joeyjo100
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  • #1
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Homework Statement


A molecule has a spectral line at 27319 cm-1

what is its wavelength?
what is its frequency?


Homework Equations


A=εCl
where A=absorbance, ε=molar extinction coefficient, C=concentration and l=path length

The Attempt at a Solution


thought about doing 1 over the spectral line for the wavelength, and correcting the units, but then realised frequency is 1 over the wavelength, which would just be the original answer

If I'm honest, i am not sure what it means by a spectral line, think the question may be badly worded
 

Answers and Replies

  • #2
Ygggdrasil
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Frequency is not 1/wavelength. It's easy to see that this equation is not true by looking at the units. Frequency has units of inverse time (e.g. s-1). Wavelength has units of distance (e.g. m). 1/wavelenght does not give units of inverse time.

Frequency is (speed of the wave)/wavelength. You can check the units to see that dividing a speed by a distance give units of inverse time.
 

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