Radioactivity and Isotopes Quiz

What is the total number of naturally occurring nuclides on Earth?

• About 3100

• About 250

• About 339

• About 74%

What is the SI unit of radioactive decay?

• Curie (Ci)

• mCi

• Becquerel (Bq)

• μCi

What type of radiation consists of high-energy light waves?

• Alpha (α)

• Beta (β)

• Gamma (γ)

• Helium nucleus

What is the process in which an unstable atomic nucleus loses energy by emitting ionizing particles and radiation?

• Nuclear reaction

• Radioactive decay

• Transmutation

• Chemical reaction

What is the time required for one half of the radioactive sample to decay called?

• Half-life (t1/2)

• Decay time

• Transformation time

• Nuclear decay time

Which type of radiation is emitted as an alpha particle?

• Electron

• Helium nucleus

• Gamma (γ)

• Beta (β)

What is the basic unit of radioactivity?

• Becquerel (Bq)

• Curie (Ci)

• mCi

• dps

What is the phenomenon of natural and artificial radioactivity?

• Nuclear decay

• Radioactive decay

• Transmutation

• Chemical reaction

Which type of reaction involves changes in an atom’s nucleus, usually producing a different element?

• Nuclear reaction

• Transmutation

• Radioactive decay

• Chemical reaction