Waves

Waves

1. Doppler Effect

   • Change in observed pitch and frequency of a wave
   • As vehicle approaches, frequency is higher and pitch is higher
   • As a vehicle moves away, frequency is lower and pitch is lower

2. Wavespeed = Frequency * Wavelength

   • Velocity of electromagentic waves: 3.8e8 m/s
   • Speed of a wave can only be changed by changing medium

3. Source of all wave motion is vibration

4. Time needed to complete one cycle is the period

5. Hertz

   • Unit of frequency
   • One cycle per second

6. Two or more waves collide at same place, its called an interference

7. A non-moving place on a wave is a node

8. Sound waves can't travel through a vacuum

9. Energy, light and sound all travel as waves

10. Energy travels in all directions

11. All waves have a similar shape

12. Amplitude is the height of a wave

13. Distance from wave to wave is the wavelength

14. Frequency is how often a wave repeats