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After a time t has elapsed, 90% of a radioactive sample is undecayed. The percent that will decay in a time 2t is
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Correct option is A
0.9 N0 = N0e–λt⇒ λ=1tln109N'=N0e−λ.2t=N09102=81 N0100∴ decayed = 19%.Talk to our academic expert!
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