 Solution

ID: past-exam-of-the-quantum-condensed-matter-course-of-the-university-of-cambridge/2007/section-a/a3/b/i/solution

In ethylbenzene, the good solvent makes effective segment repulsions swell the coil. With the Flory approximation,

R \sim 0.67 nm \times 100 0^{3/5} ≃ 42 nm .

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