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MHT CET Physics question

PhysicsNucleiMHT CET

A radioactive material decays by simultaneous emission of two particles with half-lives 1620 yr and 810 yr, respectively. The time (in yr) after which one-fourth of the material remains is

Answer: (D)

Solution

Decay constants add: , so yr; one-fourth remains after two such half-lives, $t = 2 × 540 =

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Question ID VK-084870