AnswersMHS - Physical Science - S1 - CRUnit Test

Unit Test — Unit test Answers

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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?

A
There are more radioactive substances than uranium.
B
Radioactivity is magnified by mixed substances.
C
The date of the material varied between the pure substance and mixed substance.
D
The half-life of uranium in a mixed substance is less than pure uranium.
22
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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?

A
Cameron would use carbon-14, Billy would use cobalt-60 (which releases gamma rays), and Isabelle would use uranium-238.
B
Cameron would use cobalt-60 (which releases gamma rays), Billy would use carbon-14, and Isabelle would use uranium-238.
C
Cameron would use uranium-238, Billy would use carbon-14, and Isabelle would use cobalt-60 (which releases gamma rays).
D
Cameron would use cobalt-60 (which releases gamma rays), Billy would use uranium-238, and Isabelle would use carbon-14.
23

Which describes the experiments of Becquerel and the Curies?

A
Becquerel showed that uranium requires x-rays to form radiation, and the Curies coined the term “radioactivity.”
B
Becquerel coined the term “radioactivity,” and the Curies showed that uranium requires x-rays to form radiation.
C
Becquerel discovered other radioactive elements, and the Curies showed that uranium gave off radioactivity.
D
Becquerel showed that uranium gave off radioactivity, and the Curies discovered other radioactive elements.
24

A nuclear power plant is built alongside a river. What measurements should a monitoring station downstream record to be sure that the proper procedures are being followed at the power plant?

A
density and radiation levels
B
radiation levels and dust levels
C
salt concentration and temperature
D
temperature and radiation levels
25

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?

A
1432.5 years
B
5,730 years
C
11,460 years
D
17,190 years

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