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  • of the active nuclei in a radioactive sample are found to remain undecayed after one da

\mathrm{90 \%} of the active nuclei in a radioactive sample are found to remain undecayed after one day. The percentage of undecayed nuclei left after thur days will be-

Option: 1

\mathrm{85%}


Option: 2

\mathrm{81%}


Option: 3

\mathrm{80%}


Option: 4

\mathrm{79%}


Answers (1)

best_answer

As equal fraction decay in equal time. so if a fraction of \mathrm{0.9} remains undecayed after one day, a fraction of \mathrm{(0.9)^2=0.81} will remain undecayped after two days.

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Anam Khan

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