YEAR 11 NUCLEAR PHYSICS TEST1

What is the study of nuclear physics?

• Study of planets

• Study of nuclei

• Study of stars

• Study of atoms

what is the main difference between an atom and an ion?

• ion is charge

• atom has protons and neutrons at the center

• the center is positively charges

• ions are either cations or annions

What is the atomic nucleus composed of?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Protons, neutrons, and electrons

What is the main focus of nuclear physics?

• Physical reactions

• Biological reactions

• Nuclear reactions

• Chemical reactions

Which of the following particles deflects towards the north pole if a beam of emissions is passed between tow pole pieces of a magnet?

• alpha particles

• gamma rays

• electrons

• beta particles

In the alpha particle scattering experiment, many of the alpha particles went through without any deviation. This accounts for the fact that?

• Atom is large

• the nucleus is too small

• The atom is mainly empty space

• Alpha particles have high momentum causing the to move through.

Which statement is true about radioactive decay?

• emission of alpha particles only

• sending away beta particles and gamma rays

• random and spontaneous process

• decay of atomic nuclei with the emission of protons and neutrons

An atom is electrically neutral because?

• the protons are equal to neutrons

• Neutrons are equal to electrons

• protons = electrons

• protons are positive

The rate of decay is known as?

• half-life

• radioactivity

• activity

• daughter

1.0 mg of BCG vaccine injected in a baby at birth takes 40 years to reduce to 0.03125mg.

estimate the half-life of BCG vaccine.

• 10 years

• 6years

• 20years

• 8years