PHYS 1070 Lecture Notes - Lecture 21: Transmittance, Absorbance, Pi Bond
25 Mar 2015
School
Department
Course
Professor
Document Summary
Phys1070: intro physics for life sci - lecture 21: light absorption. Absorbance has max property thats additive for mixtures and series of samples. Q: 85% of the light incidence of a sample is absorbed. Q: a solution has %t=60% in a cell of l1=1cm. What is the %t for this solution in a cell of. A2= 2c2l2 therefore; a2/a1=l2/l1 because the concentration and extinction coefficient is the same for the same solution, only the length and absorbance change. We have studied excited states of pi electrons in both linear and ring molecules. We can now also draw a different diagram to represent the energy of the entire molecule (each energy level in the old diagram will now have e1, e2 and correspond to the ground state, 1st excited state, etc. ) For (a wavelength) for light with correct energy e, to excite the 1st pi electron state of the molecule. This corresponds to a well defined single wavelength.
