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A biological researcher studies a protein fiber, consisting of long alpha helices, using x-rays with a wavelength of 1.0 1010 m.

D. A biological researcher studies a protein fiber, consisting of long alpha helices, using x-rays with a wavelength of 1.0 × 10−10 m. The diffraction pattern on a photographic film 25 cm from the fiber yields a central bright maximum that is 2.0 cm wide (the distance between the two minima on either side of the central maximum). What must be the diameter of these alpha helical proteins? (a) 2.5×10−10 m (b) 5.0×10−10 m (c) 1.25×10−9 m (d) 2.5×10−9 m (e) 5.0×10−9 m

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