If the amount of Zn-71 was reduced from 50 grams to 12.5 grams in 4 minutes, what is the half-life of Zn-71?
1 minutes
30 seconds
4 minutes
2 minutes
An isotope has a half-life of 30 minutes. Given an original sample of 100 g of the isotope, how much will be left after an hour?
100 grams
50 grams
25 grams
0 grams
During _____ only energy is released.
Positron emission
Alpha decay
Beta decay
Gamma decay
Which process would turn Rn-218 into Po-214?
Gamma decay
Beta decay
Positron emission
Alpha decay
When the sum of the masses of all the nucleons within the nucleus is less than the mass of the nucleus, what is the reaction deemed?
Unfavorable
Favorable
Ionic
Nuclear
Which of the following types of radioactive decay involves the emission of high-energy electromagnetic radiation?
Positron emission
Beta decay
Alpha decay
Gamma decay
When does the atomic number always change?
After positron emission and gamma decay
After beta decay and alpha decay
After alpha decay and gamma decay
After beta decay and gamma decay
Carbon-14 emits an electron and it becomes Nitrogen-14. Which of the following is this an example of?
Gamma decay
Positron emission
Alpha decay
Beta decay
Uranium-238 decays to form thorium-234. Which of the following is this an example of?
Positron emission
Beta decay
Gamma decay
Alpha decay
Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?
8 half-lives
7 half-lives
4 half-lives
6 half-lives
A sample of thulium-171 has a mass of 0.4055 grams. How much is left after 6 half-lives?
0.05069 grams
0.02534 grams
0.01267 grams
0.006336 grams
If a substance has a half-life of 5 years, then how much of the initial sample remains after 15 years?
One-eighth (1/8)
One-fifth (1/5)
One-sixteenth (1/16)
One-fourth (1/4)
Cobalt-57 has a half-life of about 272 days. If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, then how many half-lives passed?
1
4
2
3
Becky was recently diagnosed with an aggressive brain tumor. Her oncologist recommended treating the tumor with cobalt-60 due to its precision with treating this type of cancer. This substance is being used for _____.
radiation therapy
to cause a chain reaction
nuclear fusion
as a radioactive tracer
Which of the following statements is NOT true regarding the process of nuclear fusion?
There is currently no feasible way to harness energy
Mass is gained during the process
Two or more atoms combine to form one heavier atom
Massive amounts of energy are emitted
The type of nuclear power that occurs when a heavier atom splits into smaller pieces, which is the most common on Earth is known as _____.
nuclear fusion
radioactive carbon dating
radioactive tracer
nuclear fission
