Categorizing Waves:

•Based on their ability or inability to transmit energy through a vacuum (i.e., empty space).

1. electromagnetic waves 2. mechanical waves.

OR

•Based on the direction of movement of the individual particles of the medium relative to the direction that the waves travel.

1. transverse waves2. longitudinal waves

An electromagnetic wave is a wave that is capable of transmitting its energy through a vacuum (i.e., empty space).

Electromagnetic waves are produced by the vibration of charged particles. •Electromagnetic waves that are produced on the sun subsequently travel to Earth through the vacuum of outer space. •All light waves are examples of electromagnetic waves.

Electromagnetic waves

Electromagnetic Spectrum

mechanical wave A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum.

Mechanical waves require a medium (matter) in order to transport their energy from one location to another. • Examples: sound waves, Slinky waves, water waves, stadium waves, and jump rope waves

A wave medium is the substance that carries a wave (or disturbance) from one location to another. • a sound wave travels through air• An ocean wave travels through water

A longitudinal wave is a wave in which the particles of the medium are displaced in a direction parallel to the direction of energy transport. •Example: sound waves, seismic P (primary or pressure) waves

Longitudinal waves

Direction of energy

transport

Source of

disturbance

A transverse wave is a wave in which the particles of the medium are displaced in a direction perpendicular to the direction of energy transport. •Example: light waves, electromagnetic waves, seismic S (secondary) waves, oceanic (water) waves,

Direction of energy

transport

Source of disturbance

sources

• http://www.physicsclassroom.com• http://www.acs.psu.edu/drussell/demos.html