A radioactive substance has a half life of four months. Three fourth of the substance will decay in(a) three months(b) four months(c) eight months(d) twelve months
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three months is the answer
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The main physical property of a radioactive material is it's radioactivity itself.
But this radioactivity property is not permanent,it decomposes with the passing time period.
Similarly,if a radioactive material has a half time of four months,the 3/4 th of that particular radioactive material will be decayed in approximately three months.
That's why the correct answer of this question is Option a.
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