optically active molecules have the property of rotating the direction of poliri
ID: 1430729 • Letter: O
Question
optically active molecules have the property of rotating the direction of polirization of linearly polarized light.Many biologically important molecules have this property, some causing a counterclockwise rotation (negative rotation angle), others causing a clockwise rotation ( positive rotation angle).For example, a 5.00g.ml solution of l-leucine causes a rotation of -0.550 degree; the same concentration of d-glutamic acid causes a rotation of 0.625 degree
a) If placed between perpendicular polarizers, which of these solutions transmits the greater intensity? please explain
b) Find the transmitted intensity for each of thes solutions when placed between crossed polarizers.The incident beam is unpolarized and has an intensity of 12.5W/m^2
Explanation / Answer
a) The greater intensity will be transmitted by the solution that rotates the polarization the farthest away from 90 degree, that is, the d-glutamic acid solution.
b) Transmission through l-leucine = IL = 12.5*0.5*[cos(90 - 0.55)]^2 = 0.576 mW/m^2
Transmission through d-glutamic acid = Id = 12.5*0.5*[cos(90 + 0.625)]^2 = 0.744 mW/m^2
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