1. Mechanical vs. Electromagnetic Waves

5. Mechanical Waves Waves that require a material medium
Examples include water, sound, and waves along a spring or rope
These materials carry the energy of the wave

6. Electromagnetic Waves
Waves that DO NOT require a medium for motion
Examples include light waves, radio waves, and X-rays
All electromagnetic waves travel through space at the speed of light
Since these waves can’t be observed, we study mechanical waves

7. Electromagnetic Waves

8. Electromagnetic Waves
Mechanical Waves
Transverse Waves
Longitudinal Waves
Surface Waves
Electromagnetic Waves

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

10. 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

11. 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.

12. Earthworm Examination
Grab an earthworm from the vermicompost. Study the movement and decide whether an earthworm moves by longitudinal, transverse, or surface waves...

13. Types of Waves
Using materials around the classroom, set up a demonstration showing a:
Transverse Wave
Longitudinal Wave
Surface Wave