1. Waves Where They Come From and Where They Are Going

2. What Are Waves? Waves: any disturbance that transfers energy through matter or spaceWaves: any disturbance that transfers energy through matter or space Energy can be carried away from its source by a wave…but the material that the wave moves through does not move Example: sounds moves through air, but the air does not move

3. Wave Energy Some waves transfer energy by vibration of particles in an object Medium: substance in which waves can flow ** Can be a solid, liquid or a gas

4. Types Of Waves 2 Types2 Types 1. Transverse Waves 2. Longitudinal Waves These two waves can be identified by the direction in which the particles of the medium vibrate compared with the direction in which the waves travel

5. Transverse Waves Transverse: waves that move acrossTransverse: waves that move across Particles in a transverse wave move across or perpendicular to the direction of the wave

6. Longitudinal Waves Longitudinal: the particles of a medium vibrate back and forth along the path that the wave travelsLongitudinal: the particles of a medium vibrate back and forth along the path that the wave travels

7. Properties of Waves Amplitude: the maximum distance the wave vibrates from its rest positionAmplitude: the maximum distance the wave vibrates from its rest position Larger the amplitude = taller wave

8. What Does Amplitude Mean? Small Amplitude = low energySmall Amplitude = low energy Large Amplitude = high energyLarge Amplitude = high energy

9. What Happens When Waves Run Into Each Other? Wave Interference: occurs when two or more waves overlapWave Interference: occurs when two or more waves overlap 1. Constructive Interference 2. Destructive Interference

10. Constructive Interference As the waves come together, the individual amplitudes of the waves, combine to “construct” a newer, larger wave

11. Destructive Interference As the waves come together, the individual amplitudes of the waves, cancel each other to “deconstruct” a wave

12. Wavelength Wavelength: the distance between any two adjacent crests or compressionsWavelength: the distance between any two adjacent crests or compressions

13. Frequency Frequency: the number of waves produced in a given amount of timeFrequency: the number of waves produced in a given amount of time Expressed in Hertz

14. Wave Speed Wave Speed: the speed at which a wave travels v = λ x f Expressed in m/s V = velocity of wave λ = wavelength f = frequency (Hz)