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Q: How much Cu 61 half life about 3 hours would remain from a 2mg sample after 9 hours?

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1 mg

0.25

1 mg

1/8th of a mg. You lose half every three hours.

2.5

Related questions

After 132 hours, 1/4 of the initial sample of 10 Ci of Mo-99 would remain. Since the half-life is 66 hours, after 66 hours half of the sample would remain (5 Ci), and after another 66 hours (totaling 132 hours), half of that remaining amount would be left.

1 mg

0.25

1 mg

.25 mg

1 mg

0.25 mg

1 mg

1/8th of a mg. You lose half every three hours.

2.5

After 3 half-lives, half of the original sample would remain unchanged. After the 1st half-life: 300 unchanged atoms. After the 2nd half-life: 150 unchanged atoms. After the 3rd half-life: 75 unchanged atoms would remain.

The half life for Cu=64 is 12.7 hours. Thus, 12 hours represents 12/12.7 = 0.945 half lives.Fraction remaining = 0.5^0.945 = 0.519 remaining2 mg x 0.519 = 1.04 mg remaining