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Chemistry, 23.10.2021 15:50 Casey851

một chất phóng xạ có chu kì bán hủy là 20 năm. Hỏi cần thời gian bao lâu để 25% và 75% lượng chất đó bị phân hủy? sau 60 năm bao nhiêu phần trăm chất đó bị phân hủy ?

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một chất phóng xạ có chu kì bán hủy là 20 năm. Hỏi cần thời gian bao lâu để 25% và 75% lượng chất đó...
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