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MHT CET Physics question

PhysicsNucleiMHT CET

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately

Answer: (B)

Solution

Every 5 days 90% of the material remains, so after 20 days (4 intervals) the fraction left is ;

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Question ID VK-084901