More wave definitions

reflection

• The bouncing back as a wave hits a surface

• Free boundary – one end is free to move up and down, wave will be identical to the first wave

• Fixed boundary – one end is fixed – wave will be opposite to the original wave

Example or reflection

refraction

• Bending of waves when they pass from one medium to another less density to greater density

interference

Two waves in the same spotAs they pass through each other, they

create a new wave. After they pass each other they go back to their

original size

Constructive interference

• Two wave passing and the crests line up creating a larger wave as they pass. After they pass they go back to original size

Destructive wave interferenceWhen two waves pass each other and the crest and trough line up creating a smaller wave as they pass – after they go back to original size

Standing wave

• When two waves interfere that have the same amplitude and speed they look like they are not moving only revolving

Doppler effect

• A moving vibration pushes the wave in front making a higher frequency shorter wavelength higher pitch and the wave behind stretch out making a lower frequency – longer wave length lower pitch

Doppler with light waves

• The color of light for something going away would be red (wave stretched ou making longer wavelengths) – coming closer would be blue (waves pushed together making shorter wavelengths

• Red shift Blue shift – that’s how we know the universe is expanding