Half life of a radioactive element is10 days. The time during which remains 110 of initial mass will beA)100daysB) 50daysC) 33daysD) 16days

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1.	Half life of a radioactive element is10 days. The time during which remains 1/10 of initial mass will beA)100daysB) 50daysC) 33daysD) 16days
Answer» After three half-lives (i.e., 30 days) it remains (1/2)³=1/8 ,so it will remain 1/10^th approximately in 33 days.

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Half life of a radioactive element is10 days. The time during which remains 1/10 of initial mass will beA)100daysB) 50daysC) 33daysD) 16days