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Physics Revision: Light and Sound - Coggle Diagram
Physics Revision: Light and Sound
Reflection
normal line
angle of reflection
angle of incidence
reflected ray
incident ray
definition
- when light bounces off a luminous object
The two laws of reflection:
the angle of incidence= the angle of reflection
the point of incidence, the incident ray and the plane of reflection are all on the same surface.
Refraction
If the wave enters a denser medium, its speed decreases and it bends towards the normal line
All light waves can be refracted, which is when the speed of a wave changes as the light enters a new
medium
medium- the substance that transfers the energy or light from one place to another
definition
- the process of light waves changing speed when it enters a different density radiane.
Dispersion
definition
: the white light ray is split into a spectrum of colours. This is know as dispersion.
caused when light rays enter a denser medium and slows down, causing a sudden change in direction.
Colours and Filters
we see objects by light striking an object and then reflecting into our eye.
objects appear a certain colour because that colour is reflected by the object, whereas the other colours are absorbed
How sound travels
sound starts as vibrations.
sound travels as waves.
the bigger the vibrations the louder it is.
sounds transfer energy.
sound waves are longitudinal waves.
sound cannot travel through a vacuum as their is no matter for it to go through.
reflected sound makes an echo.
Oscilloscopes
an ocilloscope connected to a microphone can be used to display a sound wave and find its frequency and amplitude
the louder the sound, the greater the amplitude of the sound wave.
the greater the frequency of a sound wave, the higher its pitch
the wider the waves are from each other, the more quieter and low pitched the sound is and vice versa
