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28 January, 07:53

1. The half-life of the radioactive element krypton-91 is 10 seconds. If 32

grams of krypton - 91 are initially present, how many grams are present

after 30 seconds? Show the decay function. Use A = A0ekt

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  1. 28 January, 08:16
    0
    4 g after 30 seconds.

    Step-by-step explanation:

    After 10 seconds 32 * 1/2 = 16 g are present.

    After 20 seconds 32 * (1/2) ^2 = 8 g are present

    After 30 seconds 32 * (1/2) ^3 = 4 g are present.
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