Radioactivity

Question 1

Juliet started working with a radioactive substance. In 1997, she started with 200 g. When she measured again in 2002, she had 100 g left. In 2007, she had 50 g.

Revolt · Accepted Answer

C: cobalt-60

Question 2

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 3

Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the radioactivity to be 12.5% the starting amount?

Revolt · Accepted Answer

C: 18

Question 4

Matt manages a company that monitors the wastes from a company that produces radioactive byproducts. Matt is most likely a(n)

Revolt · Accepted Answer

D: nuclear scientist.

Question 5

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 6

How can doctors best detect medical problems?

Revolt · Accepted Answer

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

Question 7

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

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

Question 8

Question 8

Revolt · Accepted Answer

A: rubidium-91

Question 9

The starting amount of radioactive iodine-131 was 250 g. The half-life is 8 days. When Leslie measured the amount, she measured 15.625 g of radioactive iodine. How many days have elapsed between measurements?

Revolt · Accepted Answer

C: 32

Question 10

Carbon-14 is used to determine the time an organism was living. The amount of carbon-14 an organism has is constant with the atmosphere, but when an organism dies the carbon-14 decays at a half-life of 5,730 years. If an archeologist measured the amount of carbon-14 in an organism and it was 25% of the total amount of atmospheric C-14, what is the age of the organism?

Revolt · Accepted Answer

C: 11,460 years

Radioactivity Answers

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