T​he half life of a certain radioactive material against alpha decay is 100 days . after how much time will the undecayed fraction of material will be 6.25%? i saw many solutions but still not clear about it...thus plzz help me properly..how N=n0/2 and {1/2} to the power n...NOT GETTING AT ALL

Dear Student,

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Equal to 4 half life or 400
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400 days
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