The smallest distance between two points with the same oscillation pattern

The number of oscillations per unit of time

The time taken for once complete oscillation to occur

The distance any part of the wave has moved from rest position (can be positive/negative)

The maximum displacement from rest position to peak (IT'S ALWAYS POSITIVE)

They all travel at the same speed

Light intensity(Wm^-2) = Power(W) / Surface Area(m^2)

- (Amplitude)^2

- (1 / (distance^2))

Where a wave bounces back after hitting a boundary

Angle of reflection

The change in direction of a wave as it enters a medium at an angle to a boundary

It speeds up

It slows down

The spreading of a wave as it passes through a gap or around an edge

-The larger the gap the smaller the diffraction effect, however the smaller the gap the greater the diffraction effect

- The greater the wavelength, the greater the diffraction effect

-The smaller the wavelength, the smaller the diffraction effect

- Wave Speed changes

- Wave direction changes (Unless it travels along a medium)

(Speed of light in a vaccum) / (Speed of light in the material)

(n1 * sinΘ1) = (n2 * SinΘ2)

frequency always remains constant

Where 2 waves have a constant phase difference and same frequency

Where 2 or more waves of the same type interact in the same place

When 2 or more waves of the same type exist at the same place, the resultant wave will be found by adding the displacments of each individual wave.

The 2 waves must be coherent

- The waves wavelength is always a whole number

- The path difference is (0, 360, 720 etc)

- The phase difference is (0π, 2π, 4π etc)

- The waves wavelengths are always half numbers (i.e 1/2λ, 3/2λ)

- Their path difference is(180, 540, 900 etc)

- Their phase difference is(π, 3π, 5π etc)

λ = (a*x) / d

a = The distance between the separated slits

x = The distance between the separated fringes(distance between the centre of pattern and 1st bright edge)

d = The distance between the screen and slit

The angle between the centre of pattern and the 1st bright edge (A * sin θ)

A wave with oscillations only in one plane

A wave with oscillations in all possible planes

EM waves

n * λ = a * Sinθ

n - The order number

λ - Wavelength

a - Distance between separation of slits

Sinθ - The angle between the normal and maxima

a = 1 / N

a - Distance between slit separation

N - No of slits per metre

θ = tan^-1( h/D)

θ - Angle of order

h - Distance between maxima(distance between orders)

D - Distance beween the slits and screen

Use a single slit

A wave where energy is stored & not transferred

A wave where energy is transferred from one position to another

Points on a stationary wave where there's no displacement of particles

Points on a stationary wave where the displacement of particles varies by the maximum

The difference in displacement of particles along a wave or in 2 waves

Where a wave from source 1 arrives at the same point in its cycle as a wave from source 2

Where a wave from source 1 arrives at a different point in its cycle to a wave from source 2

Use a microwave transmitter, and use a metal plate for it to reflect the microwave. The initial wave and reflected wave superpose to make a stationary wave

- Use a string, use a pulley to hold the string tight

- Use a vibrator to cause oscillations

- The initial wave is reflected bak by the pulley

- The two waves superpose to create a stationary wave

-Progressive waves have the same amplitude at all points

-Stationary waves have different amplitudes depending on the

amount of superposition

The electrons in the metal grille absorb the electric field in the same direction as the grille

Radiowaves - 10^2

Microwaves = 10^-2

Infrared = 10^-4

Visiblelight = 0.5 * 10^-6

UV light = 10^-8

X-Rays = 10^-10

Gamma rays = 10^-12

Path difference = n * λ

- n is the order number