A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi....

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A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi....

A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi. After 2.4 hours, the activity is measured to be 1 µCi. What is the half-life of this material?

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Answer 1

Answer #1

A=A₀e^-t

$\lambda$ = 1/T_a =1/2.4=0.41

1=4*e^-0.41t

log0.25=-0.41t

0.6/0.41=t

1.44=t

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Answer 2

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