# GCSE Physics

 The flashcards below were created by user ghoran on FreezingBlue Flashcards. the line joinig the object to the image is at right angles to the mirror the image in the plane mirror is laterally inverted the image in the plane mirror is ....... and the same sizes as the object virtual the image is as far behind the mirror as is in front ....... are examples of sound being reflected echoes what is refraction it is when rays of light direction when they cross the boundary between two one trasnparent substance and an another if a light waves hits a bounday face on it : i.e. if the ray meets the boundary ar right angles (along the normal) carries on in the same direction i.e. it does not refract if a wave meets a different medium at an angle the wave changes direction - it has been refracted light travels more slowly in glass , as the light is slowed down it changes direction and is refracted ........ the normal towards when light leaves glass , it speeds up and is refracted ...... from the normal away in refrcation the angel of incidence = the angel of the emergant ray if the block is rectangular the angel of inciendence is ..... than the angel of refraction larger refraction the incident ray should be ......... to the emergant ray if the block is regtangular parralel tagaga towards (towards the normal) air -> glassaway (from the normal) glass -> air what happens to the speed of the light ray when it passes from glass to air it increases sound waves travel through solids , liquids , and gases as ...... waves longitudinal sound waves travel ..... ... than light waves more slowly sound are produced when obejcts vibrate sound waves ....... travel through a vacuum cannot the higher the frequency the higher the pitch the bigger the amplitude the louder the sound most children can hear sounds in the range from about 20 Hz to 20,000 Hz diffraction happens when a wave meets a gap in a barrier or an obstacle , they carry on through the gap , however , the waves spread out to some extent into the area beyond the gap . this is called diffraction wide gap = ......... diffraction effect small narrow gap = ...... diffraction effect large large wavelength = ..... diffraction significant diffraction only occurs when the wavelength of the wave is of same size as the width of the gap or size of the obstacle what doesnt change when a wave is diffracted the speed and wavelength of the wave how many hertz is a kilohertz 1,000 how many hertz is a mega hertz 1,000,000 hertz how many hertz is a gigahertz 1,000,000,000 hertz wave speed is measured in metres per second m/s frequency is measured in hertz , Hz wavelength is measured in metres , m Authorghoran ID150852 Card SetGCSE Physics Descriptiongjhh Updated2012-04-29T06:01:52Z Show Answers