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
During _____ only energy is released.
Gamma decay
Positron emission
Alpha decay
Beta decay
Which of the following has no mass and does not change the composition of the nucleus?
Alpha particle
Beta particle
Neutron
Gamma ray
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?
Ionic
Nuclear
Favorable
Unfavorable
The difference between the mass of the nucleus and the sum of each individual nucleon is:
Mass defect
Nucleon difference
Nucleon defect
Mass difference
Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?
4 half-lives
6 half-lives
7 half-lives
8 half-lives
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 _____.
radioactive carbon dating
radioactive tracer
nuclear fission
nuclear fusion
An element undergoes gamma decay to form lead-206. What was the identity of that initial element?
Thallium-210
Lead-206
Lead-210
Bismuth-210
Which of the following statements is NOT true regarding the process of nuclear fusion?
Mass is gained during the process
Massive amounts of energy are emitted
There is currently no feasible way to harness energy
Two or more atoms combine to form one heavier atom
Which of the following types of radioactive decay involves the emission of high-energy electromagnetic radiation?
Beta decay
Alpha decay
Gamma decay
Positron emission
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 _____.
as a radioactive tracer
to cause a chain reaction
radiation therapy
nuclear fusion
Uranium-238 decays to form thorium-234. Which of the following is this an example of?
Gamma decay
Alpha decay
Beta decay
Positron emission
Which of the following has a mass of 1 and an atomic number of 1?
Neutron
Alpha particle
Proton
Beta particle
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?
0 grams
100 grams
50 grams
25 grams
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?
2 minutes
30 seconds
4 minutes
1 minutes
Which process would turn Rn-218 into Po-214?
Alpha decay
Gamma decay
Beta decay
Positron emission
What is the energy required to break a nucleus into its individual nucleons called?
Free energy
Activation energy
Ionization energy
Nuclear binding energy
A 6.95 gram sample of radioactive nobelium-259 has a half-life of 58 min. How much is left after 2 hours and 54 minutes?
3.48 grams
0.869 grams
0.434 grams
10.43 grams
Carbon-14 emits an electron and it becomes Nitrogen-14. Which of the following is this an example of?
Positron emission
Gamma decay
Beta decay
Alpha decay
During a nuclear reaction, mass is lost. Which of the following does this result in?
An increase in the speed of light
A gain of energy
A release of energy
No change in energy
When does the atomic number always change?
After beta decay and alpha decay
After positron emission and gamma decay
After beta decay and gamma decay
After alpha decay and gamma decay
If a substance has a half-life of 5 years, then how much of the initial sample remains after 15 years?
One-fifth (1/5)
One-eighth (1/8)
One-sixteenth (1/16)
One-fourth (1/4)
What is the product of a cobalt-60 atom that undergoes two beta decays?
Manganese-60
Copper-60
Copper-62
Iron-60
The formation of uranium-236 from plutonium-240 occurs by:
alpha decay
neutron decay
proton decay
gamma decay
When neptunium-238 decays, it emits two alpha particles, a beta particle, and a gamma particle. The resulting isotope is:
Protactinium-234
Actinium-234
Thorium-230
Thorium-232
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?
2
1
3
4