IGCSE Physics (0625) Unit 5. Atomic physics-5.2.3 Radioactive decay Paper 1 IGCSE Physics 0625 Paper 1 - All Chapters QuestionA sample of radioactive isotope is decaying.The nuclei of which atoms will decay first?It is impossible to know because radioactive decay is random.It is impossible to know unless the age of the material is known.The atoms near the centre will decay first because they are surrounded by more atoms.The atoms near the surface will decay first because the radiation can escape more easily.Answer/ExplanationAns: A ...MORE IGCSE PHY Paper 1 Questions