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Author Question: A radioactive substance has a decay rate of 2.1% per minute. Of an initial amount of 1000 g of the ... (Read 72 times)

serike

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on: Jun 16, 2021

Question 1

A certain radioactive isotope has a half-life of approximately 2000 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 45% of that amount?
◦ 1725 years
◦ 1100 years
◦ 2304 years
◦ 2259 years

Question 2

A radioactive substance has a decay rate of 2.1% per minute.   Of an initial amount of  1000 g of the substance, how much will remain after 70 minutes?
◦ 257.5 g
◦ 310.4 g
◦ 206.9 g
◦ 229.9 g
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Marked as best answer by serike on Jun 16, 2021

polinasid

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Reply #1 on: Jun 16, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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serike

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Reply 2 on: Jun 16, 2021
Thanks for the timely response, appreciate it

frankwu0507

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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