Half-Life

Question 1

Which isotope is the parent isotope in this nuclear equation?

Revolt · Accepted Answer

Answer image: https://media.edgenuity.com/EVresources/3210-13-05-10-03-task/mc001-4.jpg

Question 2

Which isotope is the daughter isotope in this nuclear equation?

Revolt · Accepted Answer

Answer image: https://media.edgenuity.com/EVresources/3210-13-05-10-04-task/mc001-3.jpg

Question 3

Which of these statements about half-life is true? Check all that apply.

Revolt · Accepted Answer

Half-lives vary dramatically from isotope to isotope.; Half-lives are constant for a particular isotope.

Question 4

Lanthanum-138 has a half-life of 105 billion years. After 525 billion years, how much of a 240 g sample of this radioisotope will remain? grams

Revolt · Accepted Answer

7.5

Question 5

A sample contains 2.2 g of the radioisotope niobium-91 and 15.4 g of its daughter isotope, zirconium-91. How many half-lives have passed since the sample originally formed? half-lives

Revolt · Accepted Answer

3

Question 6

A sample contains 2.2 g of the radioisotope niobium-91 and 15.4 g of its daughter isotope, zirconium-91. If the half-life of niobium-91 is 680 years, how long will it take for the decay described in the previous question?

Revolt · Accepted Answer

2,040 years

Half-Life Answers

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