1. Waves Chapter 12.3

2. Wave motion A wave is the motion of a disturbance

3. Simple harmonic motion produces waves!!

4. Wave mediums Mechanical wave – a wave that requires a medium (solid, liquid, or gas) to move through – Ex: Sound waves are mechanical because they require air, liquid or solid to move though (sound can not travel in outer space) Non-mechanical wave – does not require a medium to move – Ex: light waves travel through the vacuum of outer space where there is no medium (all EM waves)

5. Wave Types Pulse wave – one wave that travels alone (a) Periodic wave – a wave that moves up and down repeatedly (b)

6. Transverse Waves Transverse wave – a wave whose particles vibrate perpendicularly to the direction of the wave motion

7. Parts of a wave Crest – highest point above equilibrium Trough – lowest point below equilibrium Wavelength – distance between two adjacent similar points of a wave

8. Longitudinal Wave Longitudinal wave - a wave whose particles vibrate parallel to the direction of the wave motion.

9. Period is inverse to frequency Period – amount of time for one complete vibration Frequency – number of complete cycles per second.

10. Calculating speed of a wave v = f λ v- speed of wave (m/s) f – frequency of wave (Hz) λ – wavelength (m) This can be used with both mechanical waves and non-mechanical waves.

11. Practice Problems Pg 335 1-7 1a = 343 m/s, b =2.29 ms, c=0.787 m 2a = 343 m/s, b=457 Hz, c=2.19 ms 3 = at lower freq bc wavelength is inversely related to freq 4= 1.50 m/s 5 = 3.00 m 6 = 0.600 m/s 7 = 8.00 m/s