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Radioactivity Answers

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What did the accident at the nuclear power plant in Chernobyl in 1986 demonstrate about the use of nuclear power that had not been previously demonstrated?

A
The byproducts of the process are radioactive.
B
The generation of electricity releases no carbon dioxide.
C
The uranium fuel that is used is radioactive.
D
Large areas can be contaminated with radiation.
2
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Which statements are supported by the graph? Check all that apply.

A
For large atoms, more neutrons than protons are needed to be stable.
B
Nuclei that have 90 or greater protons are always radioactive.
C
Atoms must have equal numbers of protons and neutrons to be stable.
D
Atoms that have less than 10 protons do not need neutrons to be stable.
3

Which change occurs when an atom undergoes alpha decay?

A
The nucleus loses mass and a new element is produced.
B
The nucleus gains a proton and a new element is produced.
C
The nucleus loses energy and remains the same element.
D
The nucleus loses a neutron and remains the same element.
4

The half-life of iodine-131 is 8 days. Chan Hee examines two samples of iodine-131.Sample 1: 10 gSample 2: 20 gWhat can Chan Hee expect to observe about the samples after 16 days?

A
The mass of iodine-131 in sample 1 will be 7.5 g and in sample 2 will be 16 g.
B
Three-fourths of each sample will have undergone radioactive decay.
C
Ten grams of each sample will have undergone radioactive decay.
D
One-half of each sample will still be iodine-131.
5

A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?

A
50% unchanged and 50% stable
B
25% unchanged and 75% stable
C
12.5% unchanged and 87.5% stable
D
75% unchanged and 25% stable
6

[BLANK]

A
cobalt
B
uranium
C
carbon
D
technetium
7

Sadira makes a graphic organizer to show how geologists and archaeologists use radioisotopes.Which labels belong in the regions marked X and Y?

Question illustration
A
X: Uses carbon-14Y: Uses uranium-238
B
X: Uses uranium-238Y: Determines ages of objects
C
X: Determines ages of objectsY: Uses uranium-238
D
X: Uses isotopes with short half-livesY: Determines ages of objects
9

Which is the best predictor of the radioactive nature of an isotope?

A
the proton-to-electron ratio
B
the neutron-to-proton ratio
C
the neutron-to-electron ratio
D
the electron-to-proton ratio
10

Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams.How old is the sample of calcium-51?

A
4.5 days
B
9.0 days
C
13.5 days
D
18 days

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Radioactivity Answers — TX-Physics CR