# Waves

## Transverse Waves

This is a wave that causes the particles of a medium to vibrate perpendicularly to the direction the waves travel.

Transverse waves are created by a vibration or a disturbance.

These waves are important because without them, light wouldn't travel to our eyes or we wouldn't know what seismic S-waves are.

## Longitudinal Waves

This is a wave that causes the particles of a medium to vibrate parallel to the direction the waves travel.

Longitudinal waves are created by a vibration or a disturbance.

These waves are important because they make up sound waves, pressure waves and seismic P-waves (earthquakes). We wouldn't hear anymore, talking, sounds to warn us and measuring earthquakes wouldn't exist.

## Spherical Wave Calulation

A spherical wave is a vibration that creates a circular formation of waves, for example like you see when a water drop hits the surface of water, it creates a wave in the form of a circle.

Wavelength= .9cm

Frequency= 21H

Wave Speed= 18.9cm/s

## Plane Wave Calulation

A plane wave is your average flowing wave, for example like you see in the ocean.

Wavelength= .9cm

Frequency= 25H

Wave Speed= 22.5cm/s

Reflection
Reflection - 2nd Angle
Reflection - 3rd Angle

## Reflection Waves

The angle of the first incidence was 45 degrees. The angle of reflection is also 45 degrees.

The angle of the second incidence was 165 degrees. The angle of reflection is also 165 degrees.

The angle of the third incidence was 100 degrees. The angle of reflection is 100 degrees.

## The Law of Reflection

States the angle of reflection is equal to the angle of the incidence.
Double Slit Interference

## Double Slit Interference

In a double slit experiment, the waves are first normal waves. Then if two slits are opened in a normal wave path, the wave then enters both openings and creates two spherical waves - both are interfering each other.
Spherical Wave
Interference of Waves

## Dual Pin Interference

This wave is made up of two spherical waves - both are created by two pin balls in the water as shown in the video. The two waves interfere, creating constructive and destructive interference.
Plane Wave
Diffraction - Narrow
Diffraction - Wide

## Wave Diffraction

This is the bending of a wave as it passes an edge or an opening.

The initial gap in the first video was a narrow opening so that flow of the wave looked much skinnier. In the second video, the gap had increased and the wave became wider.