Waves 1.Includes: 1.Water 2.Sound 3.Light 4.Heat 5.Earthquakes.

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Presentation transcript:

Waves 1.Includes: 1.Water 2.Sound 3.Light 4.Heat 5.Earthquakes

Waves 2. Wave = disturbance that transfers energy from place to place

3. Waves & Energy 1.What carries waves? 2.How do waves transfer energy? 3.What causes waves?

3.1 What carries waves? What do sound waves travel through? What do water waves travel through? AIR WATER MEDIUM 1.Medium = substance or material that carries the wave (what the wave travels through) 2.Mechanical wave = requires a medium to transfer energy 3.Electromagnetic wave = doesn’t require a medium to travel through

3.2 How do waves transfer energy? Particles in motion Ex: Stadium

3.3 What causes waves? 1.Disturbances from energy (wave in water, sound, movement)wave in water

Question #1 TRUE or FALSE? In order for Shane to hear Sally, air molecules must move from the lips of Sally to the ears of John FALSE – particles only temporarily move

Question #2 Every minute, ocean waves continue to splash onto the shore. In tables, explain why the beach is not completely submerged with water and why the middle of the ocean has not yet been depleted of its water supply?

Answer Ocean waves don’t transfer water, they transfer ENERGY The particles just oscillate back and forth

4. Types of waves Waves move through mediums in different ways OR

4.1 Transverse Waves Transverse waves = move the medium at right angles to the direction of the wave OR = move medium perpendicular to the direction of the wave EX:

(4.1 Transverse Waves Continued) Examples: heat waves, light waves, seismic (earthquake waves)

4.2 Longitudinal Waves Longitudinal waves = move the medium parallel to the direction of the wave Ex:

(4.2 Longitudinal Waves Continued) Examples: sound, seismic waves (earthquake)

Particle motion Wave animation

Question #3: Which type of wave is each? Transverse or Longitudinal?

Properties of Waves

Transverse Wave wavelength Direction of wave  Resting point amplitude

Key words for Transverse Resting point Amplitude wavelength

Longitudinal Waves

Key words for Longitudinal wavelength

Electromagnetic vs. Mechanical Electromagnetic waves do not need a medium to transfer the energy Ex: Light, heat waves Mechanical waves need particles (mediums) to transfer the energy Ex: Sound, Earthquake waves

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