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Unformatted text preview: PHY251 - Scattering PHY 251 Scattering Introduction The purpose of this laboratory is to show how certain characteristics of an object can be determined from the distribution of particles (or radiation) scattered from the object. In particular, we will use the scattering of a beam of laser light to indirectly measure the radius of several plexiglass cylinders. The method is similar in principle to that used in particle beam experiments to determine the size and shape of target nuclei. Measurement Method Imagine a well-collimated beam of light striking a polished circular cylinder as shown in the Figure. R is the cylinder radius, and b is the ``impact parameter'', i.e. the distance between beam and the parallel line passing through the center of the target. After striking the target, the beam is reflected such that the angle of reflection, , equals the angle of incidence. From geometry it follows that sin = b R . Defining the scattering angle = - 2 , we find that = (...
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