define displacement (waves)

The distance from the equilibrium positions

define amplitude

max displacement

Define wavelength

The minimum distance between two points in phase on adjacent waves

Define time period of oscillation

the time take to for a wave to complete one oscillation

frequency definition

the number of wavelengths passing a point per unit time

wave speed

the distance travelled by the wave per unit time

wave equation

v=f x lamda

define phase difference

the difference between displacement of particles on a wave

what is the phase difference when two particles in phase

0 or 2pi radians

what is the phase difference when two particles in anti-phase

pi radians

When does reflection occur

reflection occurs when a wave changes direction at a boundary between two different media

what is the law of reflection

angle of incidence + angle of reflection

when does refraction occur

when a wave changes direction as it changes speed form one media to another

If water is shallower the speed of the waves are ____.

slower

What is diffraction?

when waves pass through a gap or round an obstacle and spread out

what is polarised?

When a wave’s vibration is confined to one plane of oscillation

Intensity=

Power/Area

You can polarised electromagnetic waves using polarisers

This means only waves with a certain orientation can pass through

The refractive index

speed of light in vacuum/ speed or light in a material

What is the Snell’s law?

n1sin(x1)+n2sin(x2)

Total internal reflection

theta is greater than the critical angle

sin of the critical angle=

1/refractive index

super position

when two waves of the same type passing through each other

Define Coherence

Waves emitted from two sourcing having constant phase difference and the same frequency.

what does each of the symbols mean in

lamda= ax/D

a: slit separation, D: distance fro source to screen, x: separation between light and dark and screen

What is node

a Point of 0 displacement, 0 intensity and 0 amplitude on a stationary wave

What is an antinode

a Point of max displacement, max intensity and max amplitude on a stationary wave

A stationary wave in a coloumn starts and stops when in a one end closed and a both ends open

One open: Starts in middle on one end and top on open

Both open: Starts and ends on edges of tube

what does the symbols stand for in:

E=hc/lamda

Energy of photon= Planck’s constat x Frequency

One electronvolt is

the energy transferred when an electron moves through a pd of one volt

The photoelectric effects

When the electromagnetic radiation hits the surface of a metal causes electrons to be emitted

Define work function ( circle with line)

The minimum energy required to free and electron from the surface of a metal

what do the symbols mean of : hf= (circle line) + Ekmax

Energy of a photon= Work function + max KE of emmited electron

What is used to diffract electrons

polycrystaline graphite