Uranium Dating Physics Definition / Quiz - 4 For UPSC - NDA, CDS, CAPF & AFCAT Exam : Where r 0 = 1.05 fm. Uranium Dating Physics Definition / Quiz - 4 For UPSC - NDA, CDS, CAPF & AFCAT Exam : Where r 0 = 1.05 fm. . Fission reactions may ... Visit Site