Magnetism And Light Flashcards
(20 cards)
What is the law of reflection
Angle of incidence equals angle of reflection
What is refraction
Bending of light due to change in speed at a boundary
Where does refraction happen
At the boundary between air and glass or air and water
What is white light made of
Many colours
How can we show white light is made of many colours
By using a prism to show dispersion
What is dispersion
The splitting of white light into different colours
What happens when light slows down
It bends towards the normal
What happens when light speeds up
It bends away from the normal
How can colours of light be changed
They can be added
What happens when all colours of light are added
You get white light
What happens when all colours of light are absorbed
You see black
What is a magnetic field
An area around a magnet where magnetic forces can act
What do magnetic fields do
Exert forces on other magnets or magnetic materials
What is the Earth’s magnetic field caused by
The core acting like a giant magnet
What does a compass show
The direction of the Earth’s magnetic field
How can you make an electromagnet
Wrap a coil of wire around iron and run electric current through it
Why are electromagnets useful
They can be turned on and off
How can you make an electromagnet stronger
Increase the number of coils or the electric current
What is an example of an electromagnet use
In electric bells
What is the difference between a magnet and an electromagnet
A magnet is always on
