1. Topic: Waves

2. Essential Question: What are the characteristics of mechanical and electromagnetic waves?

3. Why do we care? During every moment of our lives, we are bombarded with WAVES of energy. How many waves can you name? Most energy waves collide with us or pass right through us.

4. What do Waves Do? Move energy through matter or space

5. Two Types of Waves Mechanical Waves need matter (medium) to travel through Electromagnetic Waves can travel through empty space

6. Mechanical Waves water air solids Mechanical waves travel through mediums such as:

7. May be longitudinal/Compressional Or transverse Mechanical Waves grouped according to the direction of the motion of matter caused by the movement of wave energy.

8. Types of Mechanical Waves Transverse Waves – energy moves up and down or side to side while traveling forward AmplitudeWavelength Trough Crest How often = Frequency

9. Types of Mechanical Waves Longitudinal/Compression Waves – energy moves along the medium while traveling forward Wavelength Frequency: the number of waves that are made in a given amount of time. Measured in Hertz.

10. Mechanical Waves TransverseLongitudinal Energy travels forward but moves up and down/side to side Energy travels forward in pulses

11. Put the following waves under the correct category: Slinky Compressional Sound wave Shaking a rope Electromagnetic Light

12. II. Mechanical Waves LongitudinalTransverse Sound wave Compressional Slinky Electromagnetic Wave Shaking a rope Light Slinky

13. Electromagnetic Waves Need to Know: Do not need matter/medium to travel. Can travel through space even though a vacuum. Can also travel through a medium Examples: X-Rays, Microwaves, Visible Light. Travel through space & all travel at the same speed – Speed of Light.

14. Electromagnetic Waves are Transverse Waves Only!!

15. Electromagnetic Waves – Light! Short Wavelength/ high frequency: Harmful/Can Cause Cancer Long Wavelength/ Low Frequency: Not Harmful/ Good Waves

16. Example 1 3 m 2 2 m3 m Wave Length X Frequency