Wave Fronts

A line joining the points at the same position along a wave

Periodic Time

The time it takes for an oscillation to repeat

Frequency

The number of oscillations of cycles in one second

Frequency / Time Period Equation

f = 1/T

Wave Equation

Velocity = frequency x wavelength

Phase

Waves are the same

Phase difference

Described through radians, how many cycles the wave is out of phase

0 / 360 degrees in radians

2 pi

180 degrees in radians

pi

90 degrees in radians

2/pi

270 degrees in radians

3pi/2

Transverse Waves

Displacements perpendicular to the wave velocity

Radio Wave Wavelength

10^3 - 10^1

Microwave Wavelength

10^-2

Infrared Wavelength

10^-5

Visible Wavelength

10^-7

Ultra Violet Wavelength

10^-8

x-ray Wavelength

10^-10

Gamma Wavelength

10^-12

Constructive Interference

Two Troughs / Two Crests in phase create a wave doubled in intensity

Destructive Interference

Two Troughs / Two Crests out of phase create a wave halved in intensity

Longitudinal Waves

Displacements in the same direction as the wave velocity

EM waves

Made up of electric and magnetic fields

EM waves travel at

3x10^8 ms-1