Primary waves are the fastest kind of waves that occur during earthquakes. They are the first to hit areas surrounding the seismic activity and can move through solid and liquid layers of the ground. More »

The three types of earthquake waves are primary waves, secondary waves and surface waves. Primary waves are referred to as P waves, and secondary waves are called S waves. P waves and S waves move past Earth's crust, whi... More »

Seismic waves are released during an earthquake. The three types of seismic waves generated in an earthquake are the primary wave, the secondary wave and the surface wave. More »

Sound waves, earthquakes and ocean waves are all examples of mechanical waves. Longitudinal waves, transverse waves and surface waves are the three types of mechanical waves. More » Science Physics Optics & Waves

Mechanical waves require a medium to travel through so that they can transmit energy. Some examples of mechanical waves are water waves, sound waves and the waves of a slinky or jump rope. The medium through which a mech... More »

All ultrasonic waves share the common property of being mechanical waves with a frequency higher than the upper limit of the human hearing range. The only difference in physical properties between ultrasonic and sub-ultr... More » Science Physics Optics & Waves

Nuclear radiation is the release of energy-bearing rays, waves or particles that occurs when an atom is split. This specific process is called fission, and it can occur in both natural and artificial situations. Nuclear ... More »