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The half-life of a radioactive substance...

The half-life of a radioactive substance is 1 y. After 2 y, what will the amount of the substance that will be disintegrated?

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After 1 y, the remaining substance =`1/2` part
`therefore` After 2 y, the amount of substance that will remain `=1/2xx1/2=1/4` part
`therefore` Amount of the substance that is disintegrated after 2 y `=1-1/4=3/4` part
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