Quiz3sol - Draw the path lengths from points A and B to the...

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Fall 09 7C-CD Quiz 3 Student ID:_______________ Name:______________, ______________ |____| (Last) (First) DL Sect. # I certify that I will abide by the UC Davis Code of Academic Conduct. .. Signature:_________________________ Path length difference is approximately the separation distance times the sine of the angle between the target point and target center Rubric Code: Biologist Linus Pauling solved the secondary structure of proteins using x-ray diffraction. Beta sheets consist of parallel chains of amino acids; the spacing between the chains diffracts x- rays like the slits in lab diffracted lasers. X-rays of wavelength λ = 1.00 Ångström = 10 -10 m diffract through a beta sheet onto film 1 meter away. The first maximum (besides the center) is located at an angle of 11.2 degrees, measured from the center.
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Unformatted text preview: Draw the path lengths from points A and B to the maximum at point C . Illustrate the path length difference and explain its significance. How far apart are the chains in the beta sheet spaced? Path length difference The path length difference determines the type of interference. Because point C is a maximum, the interference type is constructive. Because point C is the first maximum besides the center, the path lengths must differ by one wavelength. The space between the two sources A and B is the distance between beta sheets. 15 . 5 1484199 . 5 ) 2 . 11 sin( 00 . 1 ) sin( ) sin( 3 = = = = SigFig d d x The spacing between the beta sheets is 5.15 Angstroms...
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