physics waves and optics

What waves are transveres waves

Em waves

Secondary sismic waves

Waves on a string

Types of longitusinal waves

Sound

Primary sismic waves (p for pressure= sound)

Defenition of phase difference

It is the mesure of the difference in where 2 waves are in there cycle

Defeniton of transveres waves

Oscillate perependicular to the direction of energy propagation

Defenition of lonigudinal waves

Oscilations are parallel to the propagation of energy transfer

Which waves cant be polarised

Longitudinal

What are polarodes used in

Sunglasses (lower light iniencity)

Aerials

What same propetys do waves need to have to form stationary waves

Wavelenght

Frequency

What aplitude do nodes and anti nodes have

Nodes amplitude=0

Antinode amplitude=maximum

What happens at resonant frequencys and what wavelengs do these occur at

Harmomics

0.5λ

What is μ and what are its units

The mass per unit lenght

Kgm^-1

What dose coherent mean

2 waves must have the same frequency and wavelenght and have a fixed phase relation

When dose constuctive inteference happen

nλ

When dose destructive intefearence happpen

(n+0.5)λ

What is the single slit difraciton patten

Bright central maxima and alterating light and dark fringes on either side

Uses of difraction gratings

Analising light

Atomic spacing in crystals

What part makes up optical fibers

Cladding

Core

Protective coating

What is pulse broadining

Due to different wavelenghts arirving at different times

So signals may over lap

Pules broadaning waht is it

Due to the different paths that signals take

So signals may over lap

What is pulse absorbtion

Signall absobrd in to cladding