The nature of waves

This week we talked about the nature of waves.
A wave is a disturbance  that transmits energy through matter or empty space.
Energy can be carried away from its source by a wave.
A medium is a physical environment in which phenomena occur.
Sound waves need a medium.Sound energy travels by the vibration of particles in liquids,solids,and gases.
If there are no particle to vibrate,no sound is possible.
Light waves are electromagnetic waves.And they do not need a medium .
Transverse waves are waves that the particles of the medium move perpendicularly to the direction of the wave is travelling.
A wave on a rope is a transverse waves because the particles of the medium vibrate perpendicularly to the direction the waves moves.
A longitudinal wave is a wave in which  the particles of the medium vibrate  parallel to the direction of wave motion.A part of  a longitudinal wave where the particles are crowded together are called compression.
A part where the particles are spread apart  is a rarefaction.
Sound wave example of a longitudinal wave.
The amplitude is the maximum distance that the particles of a wave's medium vibrate from their rest position.
And the wavelength the distance from any point on a wave to an identical point on the next wave.
Frequency is the number of waves produced in a given amount of time.
And to make high frequency waves in a rope you must shake the rope quickly back and forth.
And wave speed the speed at which waves travels through a medium.