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# int 2 waves + optics

### physics waves and optics unit

how do you measure speed? speed=distance divided by time .. v=d/t
give an example of a longitudinal wave? sound wave.
give an example of a transverse wave? water wave or any wave in the electric magnetic spectrum.
what is the difference between transverse and longitudinal waves? transverse- the particles vibrate and 90 degrees to the movement of energy longitudinal- the particles vibrate the same way as the energy transfer
name the order of the electric magnetic-spectrum from high energy to low energy? gamma rays; x-rays; ultra-violet; visible light; infra-red; microwaves; tv + radio waves.
what is the speed of light? 300000000m/s
what is the amplitude of a wave? the distance from the centre line to the top of the wave.
what is the top of the wave called? crest.
what is the bottom of a wave called? trough.
what is the wave length? the distance between one point on a wave to the corresponding point on the next wave.
what is the period of a wave? What is it measured in? the time take for one wave to pass a point and is measured in seconds.
what is the symbol for period? T.
what is the frequency of a wave and what is it measure in? the number of waves that pass a point in a second and is measured in hertz Hz
how to you calculate period period= 1/frequency
what is the angle of incidence equal to? the angle of reflection.
where is the normal line? at right angles to the mirror.
what is refraction? the change in speed of light when light enters different materials.
what will happen when light changes material? - change speed - change direction
what happens when the incident angle is increased above the critical angle? total internal reflection.
what is an optical fibre? a long thin flexible piece of glass
why does light not escape from an optical fibre? total internal reflection.
what type of lens causes converging rays of light? convex
what does a concave lens do? causes diverging rays of light.
what unit is optical power measured in? Dioptres (D)
what is focal length measure in> meters (m)
what lens is used to correct short sight? concave
what lens us used to correct long sight? convex.
Created by: gayjay

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