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28 May, 22:00

if a material has a half-life of 24 hours, how long do you have to wait until the amount of radioisotope is 1/4 its original amount?

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  1. 29 May, 00:30
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    48 hours

    Explanation:

    Using the formula,

    R/R' = 2ᵃ/ᵇ ... Equation 1

    Where R = Original amount, R' = Radioactive remain, a = Total time, b = half life.

    Given: b = 24 hours,

    Let: R = X, then R' = X/4.

    Substitute into equation 1

    X / (X/4) = 2ᵃ/²⁴

    4 = 2ᵃ/²⁴

    2² = 2ᵃ/²⁴

    Equating the base and solving for a

    2 = a/24

    a = 24*2

    a = 48 hours.

    Hence the time = 48 hours
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