1. WAVES
Wave Interactions

2. Wave Interactions
Reflection - when a wave bounces back after hitting a barrier
Light waves from the sun reflecting off the moon
Echo – sound waves reflecting off a barrier
Transmitted Waves – when a wave passes through a barrier
A glass window allows light waves to pass through.

3. Refraction – the bending of a wave as the wave passes from one medium to another
Wave speed changes
Which causes wavelength to change
Travels in a new direction
Example
the pencil looks broken in a
glass of water because the light
wave is passing from air into
water and the speed of the wave changed

4. Diffraction - the bending of waves around a barrier or through an opening.
Waves usually travel in a straight line
But they may curve or bend when the wave reaches the edge of an object
Depends on the wavelength and size of barrier or opening
Example: You can hear music around the corner of a building, but cannot see who is playing the music
Sound waves have longer wavelengths & diffract better
Light waves have shorter wavelengths

5. Interference - the combination of two or more waves to form a single wave.
Constructive interference – when the crests and troughs of one wave overlap with the crests and troughs of another wave
Energy of each wave adds together to make a higher energy wave
Higher crests
Deeper troughs
Higher amplitude

6. Destructive interference – when the crests of one wave overlap with the troughs of another wave
The energy of the new wave is less than the energy of both waves and has a lower amplitude
If a crest and trough of the same amplitude meet, the result is no wave at all
inney-7th-Grade-Integrated-Science-Flexbook/r125/section/106.0/