Question

1.The half-life of polonium (^{210}Po) is 143 days. If
you have 21 grams now, how much wil you have at the end of 2 years?
(Give your answer correct to 3 decimal places.)

grams

2.A colony of bacteria grows according to the uninhibited growth model. Suppose there is 9 g of bacteria on Monday and 27 g of bacteria on Wednesday.

(a) Find a function that gives the amount of bacteria in grams
after *t* days. (Use the variable *a* to represent
the initial amount.)

*A*(*t*) =

(b) What is the doubling time for the colony? (Round your answer to
2 decimal places.)

days

Answer #1

Polonium-210 is a radioactive substance with a half-life of 138
days. If a nuclear facility is handling 255 grams of polonium-210,
then how many grams of polonium- 210 will be left in 250 days.
Round your answer 4 decimal places and remember to use labels.
Your Answer:
Answer units:

Polonium-210 is a radioactive substance with a half-life of 138
days. If a nuclear facility is handling 150 grams of polonium-210,
then how many grams of polonium-210 will be left in 210 days. Round
your answer 4 decimal places and remember to use labels.

Polonium-210 is a radioactive substance with a half-life of 138
days. If a nuclear facility is handling 250 grams of polonium-210,
then how many grams of polonium-210 will be left in 320 days. Round
your answer 4 decimal places and remember to use labels.

Polonium-210 is a radioactive substance with a half-life of 138
days. If a nuclear facility is handling 300 grams of polonium-210,
then how many grams of polonium-210 will be left in 270 days. Round
your answer 4 decimal places and remember to use your labels.

Phosphorus-32 (P-32) has a half-life of 14.2 days. If 450 g of
this substance are present initially, find the amount Q(t) present
after t days. (Round your growth constant to four decimal places.)
Q(t) =
What amount will be left after 17.6 days? (Round your answer to
three decimal places.)

You have 89.165g of a radioactive element with a half-life of
59.65minutes. After 285.9 minutes have passed, how many grams of
the radioactive element remain? Report your answer to 2 decimal
places.

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