Pretest

Question 1

Manganese- 52 has a half-life of 6 days. How many days would a scientist have to wait for the radioactivity to be 12 point 5 percent the starting amount?

Revolt · Accepted Answer

A: 18

Question 2

Which best describes the results of Becquerel’s experiments?

Revolt · Accepted Answer

A: Both formed images when placed in their respective places.

Question 3

Which describes the experiments of Becquerel and the Curies?

Revolt · Accepted Answer

B: Becquerel showed that uranium gave off radioactivity, and the Curies discovered other radioactive elements.

Question 4

Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6 protons and 7 neutrons, while carbon-14 has 6 protons and 8 neutrons. Based on the trend with carbon and the fact that plutonium has 94 protons, how many neutrons are in radioactive plutonium-244?

Revolt · Accepted Answer

C: 150 neutrons

Question 5

Jai was measuring the radioactivity of different radioactive isotopes. Isotope A had a starting radioactive level of 50 g, and after 4 days it measured at 30 g. Isotope B had a starting radioactive level of 75 g, and after 4 days it measured at 25 g. Which best explains the isotopes?

Revolt · Accepted Answer

A: Isotope A has a longer half-life than Isotope B.

Question 6

Which is one use for radioactive isotopes?

Revolt · Accepted Answer

B: archaeology

Question 7

The starting amount of radioactive iodine- 131 was 250 g The half-life is 8 days. When Leslie measured the amount, she measured 15 point 6 2 5 g of radioactive iodine. How many days have elapsed between measurements?

Revolt · Accepted Answer

C: 32

Question 8

What was the commonality between Becquerel and the Curies in terms of their work?

Revolt · Accepted Answer

D: uranium

Question 9

The Curies took pure uranium and a uranium-containing substance. When they measured the amount of radioactivity, there was more in the uranium-containing substance than the pure uranium. Which idea did the Curies most likely develop?

Revolt · Accepted Answer

A: There are more radioactive substances than uranium.

Question 10

How can doctors best detect medical problems?

Revolt · Accepted Answer

A: by injecting a radioactive isotope that travels to the target tissue and measures the amount of radioactive decay

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