MCQ 30/31
In a nuclear reaction, which of the following is not conserved?
Electric charge. Energy. Nucleon number. Momentum. NONE OF THE ABOVE
After three half-lives, what fraction of the original radioactive material is left?
1/8
Which radiation induces the most biological damage for a given amount of energy deposited in tissue?
Alpha particles.
What is the difference between nuclear fission and nuclear fusion?
In nuclear fission, a nucleus splits; in nuclear fusion, nucleons or nuclei and nucleons join to form a new nucleus.
Which of the following is true?
Radiation is a natural part of the environment. Any amount of radiation is harmful to living tissue.
There are 82 protons in a lead nucleus. Why doesn't the lead nucleus burst apart?
The strong nuclear force holds the nucleus together.
The half-life of a radioactive nucleus is
the time it takes for half of the substance to decay.
A nucleus has
less energy than its component neutrons and protons have.
As a radioactive sample decays,
the activity does NOT remain the same. the number of radioactive nuclei does NOT increase the half-life neither increases or decreases.