an element with initial mass 1 kg started radioactivity in 2021 , in which year the element will lose 0.5 kg ? knowing that the decay constant for element is 693.147*10^-5 / year
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an element with initial mass 1 kg started radioactivity in 2021 ,
in which year the element will lose 0.5 kg ?
knowing that the decay constant for element is 693.147*10^-5 / year
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