G4 T3 L1 Waves March 1

G4 T3 L1 Waves March 1

Objective: I can tell what a wave is.

Do Now

1- The energy that comes from beneath the Earth's surface is (solar/ hydropower/ geothermal) energy.

2- The energy that comes directly from the sun is (geothermal/biomass/solar) energy

3- Which gas considered a greenhouse gas is (oxygen/ nitrogen/ carbon dioxide).

4- Define scrubbers.

Waves

Waves

Waves are around us all the time

Light and sound are types of waves

Ripples on a lake are also types of waves.

Wave

• A disturbance that carries energy and travel in repeating patterns.

• The disturbances that cause waves are vibrations.

• The energy that causes the vibration is the energy carried by the wave.

How does energy travel?

• light energy travel through empty space.

• other wave types need a medium to travel through.

• Example:

• Sound waves travel through air

Wave Speed

• It's different for different wave types of and wave mediums.

• Example: speed boat.

• Its vibrations make water waves and sound waves at the same time.

• The sound of the boat reaches your ear before the water waves do.

• Light waves travel even faster than sound waves.

G4 T3 L1(Waves and Information)

Objective: I can describe the wave characteristics.

Do Now

1- Define Waves

2- Sound energy needs a medium to travel through like ( air/space/sand)

3- Lightwave can travel faster than sound (True or False)

4- (heat/sound/light) is the one energy that can travel through empty space.

Wave Characteristics

• Wave characteristics depend on the vibration that causes the wave.

• Example (The Drum)

Amplitude:

• When you hit the drum, the drum surface pushes the air next to it.

• The air then makes a sound wave.

• Amplitude:

• The greatest height of a wave from its position.

• High amplitude sounds are louder.

Wavelength:

• The distance between two similar points in a wave.

• can be measured between two high points or two low points

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Frequency:

• The number of wave repetitions in a certain amount of time.

• If the drum head moves faster it will give high frequency.

• High frequency have high pitch

You Tube

https://www.youtube.com/watch?v=1NJHHA9bp5Y

(wave amplitude and wavelength)