Unit Test

Question 1

Which isotope is the parent isotope in this nuclear equation?

Revolt · Accepted Answer

C:

Question 2

Which isotope is the daughter isotope in this nuclear equation?

Revolt · Accepted Answer

B:

Question 3

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

Revolt · Accepted Answer

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

Question 4

Did you perform the calculations correctly on the previous question?

Revolt · Accepted Answer

A: Yes, I got the correct answer.; B: Yes, but I got the wrong answer because of a math error.; C: No, I divided the mass of the original sample by a number other than 32.; D: No, I calculated the wrong number of half-lives for 525 billion years.

Question 5

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

C: 2,040 years

Unit Test Answers

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