Radioactivity and Nuclear Physics Quiz

Which particle is found in the nucleus of an atom?

• Electron

• Proton

• Neutron

• Both B and C

Who is credited with the discovery of radioactivity?

• Albert Einstein

• Marie Curie

• Henri Becquerel

• Ernest Rutherford

The unit used to measure radioactive activity is:

• Gray (Gy)

• Sievert (Sv)

• Becquerel (Bq)

• Roentgen (R)

Isotopes are atoms of the same element that have:

• The same number of protons but different numbers of neutrons

• The same number of neutrons but different numbers of protons

• Different numbers of protons and neutrons

• The same number of electrons but different numbers of protons

Which of the following terms refers to atoms that have the same mass number but different atomic numbers?

• Isotopes

• Isobars

• Isotones

• Isomers

Which type of decay involves the emission of a helium nucleus from a radioactive atom?

• Alpha decay

• Beta decay

• Gamma decay

• Neutron decay

What is the half-life of a radioactive substance?

• The time taken for half of the radioactive nuclei to decay

• The time taken for the substance to completely decay

• The time taken for the radioactive nuclei to lose all their energy

• The time taken for the substance to reduce its activity by 25%

Which mode of radioactive decay does not change the atomic number of an element?

• Alpha decay

• Beta-minus decay

• Beta-plus decay

• Gamma decay

Which scientist is known for the discovery of the neutron?

• James Chadwick

• Niels Bohr

• Ernest Rutherford

• J.J. Thomson

What is the term for the process in which a nucleus splits into two or more smaller nuclei?

• Fusion

• Fission

• Decay

• Transmutation