1. Mechanical vs. Electromagnetic Waves
INTRODUCTION TO WAVES
Mechanical vs. Electromagnetic Waves

2. Rhythmic disturbances that carry energy without carrying matter
What are Waves?
Rhythmic disturbances that carry energy without carrying matter

3. Electromagnetic Waves
Mechanical Waves
Transverse Waves
Longitudinal Waves
Surface Waves
Electromagnetic Waves

4. Mechanical Waves Waves that require a material medium
Examples include ocean waves; ripples in water; seismic waves; sound, and waves along a spring or rope; wave of people at a sporting event
These materials carry the energy of the wave

5. Some examples of Mechanical Waves

6. Transverse Waves
Particles of medium vibrate perpendicular to the direction of the motion of the wave
Examples include guitar strings, waves in piano strings

7. Parts of a Transverse Wave
The crest is the highest point on a wave.

8. Parts of a Transverse Wave
The trough is the valley between two waves, is the lowest point.

9. Parts of a Transverse Wave
The wavelength is the horizontal distance, either between the crests or troughs of two consecutive waves.

10. Parts of a Transverse Wave
The amplitude is the peak (greatest) value (either positive or negative) of a wave. The distance from the undisturbed level to the trough or crest.

13. Longitudinal Wave
Particles of medium to move parallel to the direction of the wave
Examples include sound waves, waves through fluids, liquids, gases or plasma

14. Compressional Wave (longitudinal)
A mechanical wave in which matter in the medium moves forward and backward along the same direction that the wave travels.
Ex. Sound waves
A slinky is a good illustration of how a compressional wave moves

15. Parts of a Compressional Wave (Longitudinal)
The compression is the part of the compressional wave where the particles are crowded together.

16. Parts of a Compressional Wave (Longitudinal)
The rarefaction is the part of the compressional wave where the particles are spread apart.

17. Surface Waves Mixture of transverse and longitudinal waves
Example: At the surface of the water, particles move parallel and perpendicular to the direction of the wave.

18. Electromagnetic Waves
Waves that DO NOT NEED matter (medium) to transfer energy Examples: radiation, TV & radio waves, X-rays, microwaves, lasers, energy from the sun, visible light Electromagnetic waves are considered transverse waves because they have similar characteristics; therefore, they have the same parts.

19. Electromagnetic Waves