A radioactive material decays by simultaneous emission of two particles with…

PHYSICS · Single correct · GCSE · Physics · Atomic Structure · Atomic Structure

Problem

A radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains is (1) 1080 (2) 2430 (3) 3240 (4) 4860

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