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.