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We present a conclusive answer to Bertrand's paradox, a long standing openissue in the basic physical interpretation of probability. The paradox dealswith the existence of mutually inconsistent results when looking for theprobability that a chord, drawn at random in a circle, is longer than the sideof an inscribed equilateral triangle. We obtain a unique solution bysubstituting chord drawing with the throwing of a straw of finite length L on acircle of radius R, thus providing a satisfactory operative definition of theassociated experiment. The obtained probability turns out to be a function ofthe ratio L/R, as intuitively expected.

Bertrand's paradox: a physical solution