Grade 12 Physics Quiz 2

The nucleus is composed of particles called …………

• protons

• neutrons

• nucleons

The principal role of the ………………. in an atomic nucleus is to act as a sort of nuclear cement

to hold the nucleus together

• electrons

• neutrons

• protons

Nucleons are bound together by an attractive nuclear force called the ………… force

• strong

• weak

• gravitational

Particles that decay by spontaneously emitting charged particles and energy are said to be ….

• radioactive

• wavelengths

• decaying

………………….. is the name given to the charged particles and energy emitted by an unstable

nucleus or particle

• Insulation

• Radiation

• Magnification

The atoms of radioactive elements emit THREE distinct types of radiation called …………………

particles, beta particles and gamma rays

• omega

• delta

• alpha

The penetrating power of radiation depends on its ………………….. and its charge

• motion

• force

• speed

An ………….. is a form of an element having a particular number of neutrons in the nuclei of

its atoms

• isobar

• isotope

• isotherm

Isotopes of an element are ……………. identical but differ in the number of neutrons

• chemically

• physically

• atomically

The ……. of a radioactive material is the time needed for half of the radioactive atoms to decay 

• full-life

• half-life

• empty-life