Waves 7 th Grade Science. Types of Waves Electromagnetic Waves: Do not require a medium to move...

Waves7th Grade Science

Types of WavesElectromagnetic Waves: Do not require a medium

to move

Matter Waves: Produced by electrons and particles

Mechanical: Requires a medium to travel (air, water, rope)

A. Transverse: Move perpendicular to direction of the wave.

B. Longitudinal: Move parallel to direction of the wave.

C. Surface: Both transverse and longitudinal mixed together

TransverseExamples: Radio, Heat, and Light

Longitudinal(Compression)

Sound Waves

Surface WavesWater

Parts of a WaveUse your green packet to define the parts of a

wave.

Amplitude:

Wavelength:

Frequency:

Speed:

Parts of a WaveCheck your definitions

Amplitude: The maximum distance the medium vibrates in a medium. (Crest to Trough)

Wavelength: The distance between one crest and the next or from trough to the next trough

Frequency: The number of times waves pass a point in a certain amount of time

Speed: Different waves travel at different speeds

Changing Direction of

WavesReflection: A wave

cannot pass through a medium, instead it

bounces back

Ex. Mirror

Changing Direction of

WavesRefraction: When one

area of a wave changes direction

before another area.

Ex. Straw in cup

Changing Direction of

WavesDiffraction: When waves move/bend around a barrier

See video