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rubidium-91

iodine-131

cesium-135

uranium-238

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?

102 neutrons

108 neutrons

150 neutrons

338 neutrons

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

polonium

radium

uranium

cesium

How can doctors best detect medical problems?

by using a radioactive isotope to kill unwanted cells and target diseased tissue

by measuring the half-life of an isotope found in the skin with high-energy gamma radiation from outside the body

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

by administering a drug that targets replicating cells

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?

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?

1432.5 years

5,730 years

11,460 years

17,190 years

Which best describes the results of Becquerel’s experiments?

When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.

When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image.

Both formed images when placed in their respective places.

Neither formed images when placed in their respective places.

Which is one use for radioactive isotopes?

sanitation

architecture

meteorology

archaeology

Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. A scientist who wants to date materials older than 40,000 years would most likely use which radioisotope?

uranium-238

rubidium-91

iodine-131

cobalt-60

Cameron is a doctor treating a cancer patient, Billy is an archeologist dating a vase, and Isabelle is a geologist dating a layer of soil. Which isotopes would each person most likely use?

Cameron would use carbon-14, Billy would use cobalt-60 (which releases gamma rays), and Isabelle would use uranium-238.

Cameron would use cobalt-60 (which releases gamma rays), Billy would use carbon-14, and Isabelle would use uranium-238.

Cameron would use uranium-238, Billy would use carbon-14, and Isabelle would use cobalt-60 (which releases gamma rays).

Cameron would use cobalt-60 (which releases gamma rays), Billy would use uranium-238, and Isabelle would use carbon-14.

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