Q133. Radioactive material decays by simultaneous emission of two particles with half-lives of 1620 and 810 years. What is the time, in years, after which one-fourth of the material remains?Physics — NUST Mock 9 — Question 133 of 200A. 2430 yearsB. 1080 yearsC. 3240 yearsD. 4260 yearsPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →