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Questions  

After a time t has elapsed, 90% of a radioactive sample is undecayed. The percent that will decay in a time 2t is

a
19 %
b
81 %
c
20 %
d
40 %

detailed solution

Correct option is A

0.9 N0 = N0e–λt⇒       λ=1tln109N'=N0e−λ.2t=N09102=81 N0100∴  decayed = 19%.

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