Topic 5: Light and the electromagnetic spectrum Flashcards
what is specular reflection
when light reflects evenly off of a smooth surface
what is diffuse reflection
when light is scattered in all directions off of a rough surface
what 7 colours make visible light
Hint*
roy g biv
red orange yellow green blue indigo violet
what are the primary colours of light
red blue green
how does the power of a lens relate to its focal length
if a lens has a shorter focal length then it is said to be more powerful
what are the 3 main things all EM waves have in common
all travel at the speed of light
all can travel though a vacuum
they are all transverse
what are the EM waves
in order
Radio waves Microwaves Infrared Visible light Ultraviolet X-rays Gamma rays
the Em waves are in order of increasing _________
frequency
the Em waves are in order of decreasing __________
wavelength
what EM wave can our eyes detect
visible light
how do our bodies stay at a constant temperature
it radiates the same average power that its absorbs
what happens to a body if the average power it
radiates is less or more than the average power that it
absorbs
if the body takes in more than it gives out then it will start to heat up
but if it takes in less than it takes in then it will cool down
potential danger associated with an electromagnetic wave increases with _________ ________
increasing frequency
what is an effect of excessive exposure to microwaves
internal heating of body cells
what is an effect of excessive exposure to infrared
skin burns
