Waves

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# Waves - PowerPoint PPT Presentation

Waves. Includes: Water Sound Light Heat Earthquakes. Waves. 2. Wave = disturbance that transfers energy from place to place. 3. Waves & Energy. What carries waves? How do waves transfer energy? What causes waves?. MEDIUM. 3.1 What carries waves?. AIR.

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## Waves

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Presentation Transcript
Waves
• Includes:
• Water
• Sound
• Light
• Heat
• Earthquakes
Waves

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

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

MEDIUM

3.1 What carries waves?

AIR

• What do sound waves travel through?
• What do water waves travel through?

WATER

• 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

3.3 What causes waves?
• Disturbances from energy

(wave in water, sound, movement)

Question #1

FALSE – particles only temporarily move

TRUE or FALSE?

In order for Shane to hear Sally, air molecules must move from the lips of Sally to the ears of John

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?
• 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
Transverse Wave

wavelength

Direction of wave 

amplitude

Resting point

Key words for Transverse
• Resting point
• Amplitude
• 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