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     EduGorilla 
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    The half-life of a radioactive substance is 40 years How long will it take to reduce to one-fourth of its original amount and what is the value of decay constant respectively?

    Options :-

    1. 40 yr, 0.9173/yr
    2. 90 yr, 9.017/yr
    3. 80 yr, 0.0173/yr
    4. None of these
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