WAVES Waves A wave is any disturbance that

WAVES!!

Waves A wave is any disturbance that transfers energy through matter or space If a pebble is thrown into water, you would see waves moving outward from the place where the pebble entered the water. The energy travels through the wave. 2

3 All waves are disturbances that transmit energy. Energy from the pebble moves in a right angle from the up and down motion of the water as the wave passes This interruption of the quiet, calm water is called a disturbance.

Medium The 4 material through which waves can travel is called a medium Energy is also carried from the source by vibrations A vibrating particle transfers its energy to a nearby particle and so on.

MECHANICAL Waves A medium can be gas, a liquid, or a solid A wave that needs a medium to travel is called a mechanical wave. Water is the medium for ocean waves 5

Mechanical Wave Classification 6 Waves are classified according to the way they move and the medium they use. A wave that transfers energy in a direction that is perpendicular (at a right angle) to its medium is called a transverse wave

ELECTROMAGNETIC Waves Not 10 all waves need a medium to transfer energy Visible light, microwaves, ultraviolet light, X-rays, infrared waves, and gamma rays can all travel through empty space

Examples of Waves that need Mediums Air is the medium for the sound waves that form when a musical instrument is played. *What is an example of sound moving through a solid? Water waves and sound waves are examples of mechanical waves 11

More Examples of Wave Earthquakes provide an Activity example of how waves transfer energy without transferring matter During an earthquake, waves travel away from the point where 12

Waves While the ground shakes from side to side and up, and down, the ground itself does not travel large distances from the source The energy is what is transferred over long distances. 13

Waves A 14 transverse wave is made up of high points called crests and low points called troughs

RECAP: Waves are any disturbance that transfers energy There are 2 types of waves: 1. Mechanical ~ needs a medium(solid, liquid, gas) to transfer energy Sound, water, earthquakes ect. 2. Electromagnetic~ does not need a medium to transfer energy through. Light, radio, gamma, and x rays.

Waves 17 A wave in which particles vibrate back & forth along the path that the wave moves is known as a longitudinal wave

Waves The part of the longitudinal wave where the particles are bunched up is called a compression * A compression is similar to the crest of a transverse wave 18

Waves The part of a longitudinal wave in which the particles move away and spread apart is known as rarefaction 19

Waves The 20 longitudinal wave is moving parallel to the direction the particles are moving * This rarefaction of a longitudinal wave is similar to the trough of a transverse wave

Waves Not 21 all waves need a medium to transfer energy Visible light, microwaves, ultraviolet light, X-rays, infrared waves, and gamma rays can all travel through empty space

Waves A Disturbance that 22 transfers energy through a field is an electromagnetic wave or EM wave * A field is an area around which an object can apply a force upon another object without actually touching it