1. WAVES-- A disturbance that transfers energy through matter or space
A wave requires a medium—material that is disturbed by
the wave
Air
Water
Solid Objects
The wave moves the medium’s particles from their resting position
They do not travel with the wave—
just up/down or back/forth
Some kinds of waves do not require a medium
Electromagnetic Waves
Light waves/Radio waves

2. Shorter wavelength = more energy
Crest
High point
Amplitude
Resting position
Trough
Low point
Wavelength
Wavelength--
Distance from any point on a wave to the identical point on the next wave
Amplitude—distance from the midpoint (resting position) of the wave to its top (crest) or its bottom ( trough)
Shorter wavelength = more energy

3. The number of waves that pass a given point in one second
Frequency--
The number of waves that pass a given point in one second
Frequency and wavelength are inversely related???
When frequency increases—wavelength decreases or vice versa!!
2 kinds of waves
Transverse Waves--
Particles of the medium move perpendicular to the path of the wave
Longitudinal Waves--
Particles of the medium vibrate parallel to the path of the wave

4. Let’s Practice Compression-- Rarefaction--
Part of the wave where particles are pushed closed together
Part of the wave where particles are spread apart
Let’s Practice
Number your paper 1 - 4
1. Which of the following is NOT a medium?
Space B. Air
C. Water D. Wood

5. 2. A wave’s amplitude is
A. The distance from the resting point to a crest or trough.
B. The distance between the crest of one wave and the crest of the next wave.
C. The distance the wave travels in one second.
D. The number of waves that pass a given point in one second.
3. Picture a tub filled with water and a toy boat floating on the water. You plunge your fist in the water, next to the toy boat. What will happen to the boat?
It will travel to the other end of the tub.
It will stay completely still.
It will travel closer to your fist.
It will bob up and down.
4. Which part of a transverse wave is similar to a compression in a longitudinal wave?
A. Trough B. Midpoint C. Crest D. Particle