1. WAVES: Class Wave
A wave is a rhythmic disturbance that carries energy without carrying matter, through matter or empty space.

2. Waves that move through matter: Mechanical
Mechanical Waves
Waves that move through matter: Mechanical
Mechanical waves move through matter:
air, water, dirt, and other objects.
Ex: Water! Energy is transferred from molecule to molecule they are transported without the molecules moving themselves
The matter that it travels through is called a Medium
Mechanical waves are produced by something vibrating
Ex: Rope

3. Types of Mechanical Waves
Transverse
Wave energy causes matter in the medium to move up down or back and forth at right angles
Rope
Peaks: Crests
Valleys: Trough
Compressional
Longitudinal Waves
Matter moves forward and backward in the same direction
Slinky

4. Electromagnetic Waves: Let’s use our book
Electromagnetic waves move
through empty space and matter;…..
air, water, dirt, and other objects plus they can travel through space
Ex. Sun rays, radio waves, infrared, X rays
Magnetic Fields
Transverse

5. Types of Wave
There are two types of waves. Mechanical and Electromagnetic. Then there are two types of mechanical waves.
WAVES
Electromagnetic wave
Mechanical
Waves
Compressional
Wave
Transverse Wave
Transverse Wave
Transverse wave

6. A transverse wave has different parts from a compressional wave.

7. Compressional wave
The place where the coils are squeeze together is called a compression.
The place where the coils are spread apart are called rarefactions.
A series of compressions and rarefactions forms a compressional wave.

8. Properties of Waves: -Wavelength -Frequency -Amplitude -Speed

9. Wavelength
The wavelength of a transverse wave is the distance between two adjacent crest or two adjacent troughs.
The wavelength of a compressional wave is the distance between two adjacent compressions or rarefactions.

10. Frequency
The frequency of a wave is the number of wavelengths that pass by a point each second.
The SI unit for frequency is the hertz, (Hz).
Frequency = Number of Wavelengths/Time

11. Frequency: how many wavelengths pass a point at a given time Note: as Frequency increases wavelength decreases

12. Solving Frequency
What is the frequency of a wave if 10 wavelengths pass a point in 2 s?
What is the frequency of a wave if 50 wavelengths pass a point in 5 s?
What is the frequency of a wave if 100 wavelengths pass a point in 10s?
What is the frequency of a wave if wavelengths pass a point in 5s?(use a calculator)

13. Amplitude
The amplitude of a wave is the maximum distance matter moves as the wave passes.

14. Amplitude and Energy
The larger the amplitude of a wave, the more energy the wave carries.

15. Wave Speed The wavelength, frequency, and speed of a wave are related.
To calculate the speed of a wave the following formula is needed:
Wavelength(in m) = Wave speed (in m/s)
Frequency (in Hz