Suppose an element has a half-life of 7 days. Determine which equation best models Q (t), the amount in milligrams (mg) of the element after t weeks, if there were initially 12.5 mg.
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Suppose an element has a half-life of 7 days. Determine which equation best models Q (t),...
Question 33 5 pts 33. A radioactive element X has the half life of 2 weeks. Calculate the remained amounts of the element X after 18 days if the initial amounts is 18 mg. 7.4 mg 1.8 mg 0,00 mg 12 mg D Question 32 6 pts 32. Determine the element considering the following nuclear reaction: 138 ss Cs ---------- > ?+ 0.se Te Ba Sr Pb
The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced to a mass of 4 mg. What was the initial mass (in mg) of the sample? What is the mass 5 weeks after the start? Submit Question
Calcium-47, used to evaluate bone metabolism, has a half-life of 4.5 days. How many milligrams of a 49-mg sample of calcium-47 remain after 54 days? Express your answer using two significant figures. mg
If a substance has a half-life of 3.70 days, and there are initially 50.0 g of the substance, how many grams will remain after precisely three weeks? Report your answer with three significant figures.
10) The half-life of lodine-131 is 8 days. The initial amount is 20 milligrams. a) Find a function which gives the amount of lodine-131, Act), in milligrams, t days later. Round k, the decay constant, to four decimal places. b) Determine the length of time it takes for 70% of the material to decay. Round your answer to two decimal places. Be sure to label the answer.
The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours. Q(t) = 67e-0.0011997 (b) How much will remain after 85 hours? (Round your answer to one decimal place.) 60.5 mg (c) When will the initial mass decay to 20 milligrams? (Round your answer to one decimal place.) 1008.3 x hr
9. Technetium-99m is an ideal radioisotope for scanning organs, because it has a half-life of 6.0 hr and is a pure gamma emitter. Suppose that 80.0 mg were prepared in the technetium generator this morning. How many milligrams would remain after: a. one half-Life b. two half-lives c. 18 hrs. d. 24 hrs.
If a compound has a half life of 48 hours and a dosage of 75mg is taken every 2 days, what is total amount of the compound will remain after 2 weeks? 4 weeks?
The half-life of a certain radioactive element is 48.0 hr. a) Determine the decay constant in s^-1. b) If we started with 100.0 grams of this element, how much would be present in grams after 20.0 days? Work this out using the exponential decay formula.
PCO) = db) 1 CORRI The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced to a mass of 3 mg. What was the initial mass ſin mgl of the sample? What is the mass 6 weeks after the start? Question Help: D video Video Message instructor D Post to forum Submit Question Type here to search o G $