What are two kinds of waves?Section 7-2

The particles of the medium move up and down at right angles to the direction of the

motion of the wave.Ex. Pull up and down on a rope tied to a

doorknob, ocean waves.

Transverse Waves

Crest – The high point of a

transverse wave.

Trough – The low point of a

transverse wave.

Transverse Waves

A wave in which the particles of the medium move back and forth in the

direction of the wave motion. Ex. Clap of thunder.

Longitudinal Waves

Compression – A clap of thunder

pushes the particles of air close together. The compressed particles move forward in the direction of the wave motion.

Rarefaction – As the particles

move forward, they leave

behind a part of the wave where the particles are far apart. It also moves forward in the direction

of the wave motion.

Longitudinal Waves

H.W.p. 117 check/apply 1-9

wkst. 7-2activity 15-3 -

pendulumenrichment 7-2

measuring earthquakes

investigating the speed of earthquake

waves