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5 October, 05:35

The half-life of a certain isotope is 1 day. At the end of 3 days, how much of the isotope remains? 1/16, 1/8, noneof it, 1/3, none above

The half-life of a certain isotope is 30 seconds. How much of a 200 g sample will remain after 2 minutes?

50, 6.25, 170, 12.5, 100

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  1. 5 October, 07:16
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    A) The half-life of a certain isotope is 1 day. At the end of 3 days, how much of the isotope remains?

    1/16,

    1/8,

    none of it,

    1/3,

    none above.

    Answer:

    1/8

    Explanation:

    Given dа ta:

    Half life of isotope = 1 day

    At the end of day remaining amount = ?

    Solution:

    Consider that original amount of isotope is 100%.

    At time zero = 100%

    At one day = 100/2 = 50%

    At second day = 50/2 = 25%

    At third day = 12.5%

    It is the 1/8 of 100.

    Multiply the 12.5% * 8 = 100%

    It means at the end of 3rd day 1/8 of original amount will remain.

    B) The half-life of a certain isotope is 30 seconds. How much of a 200 g sample will remain after 2 minutes?

    50, 6.25, 170, 12.5, 100

    Answer:

    12.5 g

    Explanation:

    Given dа ta:

    Half life = 30 sec

    Total amount = 200 g

    Amount after 2 min (120 sec) = ?

    Solution:

    Half lives = T elapsed / half life

    Half lives = 120 sec / 30 sec

    Half lives = 4

    At time zero = 200 g

    At first half life = 200 g / 2 = 100 g

    At second half life = 100 g/2 = 50 g

    At third half life = 50 g/2 = 25 g

    At 4th half life = 25 g/2 = 12.5 g
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