Light and EM Spectrum Flashcards
When a white light shines through a prism what colours does the white light split into?
Red, Orange, Yellow, Green, Blue, Indigo and violet.
When light enters a more dense medium which way does the light ray bend?
It bends towards the normal.
What is the normal?
A line which is 90 degrees to the mirror
Which colours are the primary colours of light?
Red, Blue and Green
Which rays have the smallest wavelengths?
Gamma Rays
Which rays have the biggest wavelengths?
Radio Rays
Which light is refracted the most?
Violet light
Which light is refracted the least?
Red light
Objects that give out light are called what?
Luminous
True or False?
“The angle of incidence is equal to the angle of reflection.”
True
When a white light ray is split into a spectrum of colours what is it called?
Dispersion
What does EM stand for?
Electro magnetic
Does light travel faster than sound?
Yes
Yellow light is a mixture of what?
Red light and Green light
What are the three secondary colours of light?
Magenta, Cyan and Yellow
What colour would a green leaf look under a red light?
Black
True or False?
The speed of light is 300,000,000 metres per day
False
It is actually 300,000,000 metres per second
If there is white light and a green ball, then a red filter is put between, what colour would the ball appear?
Black
True or False?
All surfaces either scatter or reflect light
True
Which waves can the human eye see?
Visible (light rays)
Which waves does the sun give off?
Ultraviolet
A yellow object would appear what colour under cyan light?
Green
Why does red materials look red?
Red materials look red because they only reflect red light and absorb blue and green light
When light passes from air into glass, the angle of incidence is always ________ than the angle of refraction.
Bigger
Does mixing paints follow the same rule as mixing light?
No it doesn’t because they have different primary and secondary colours.
A rocket was fired above a seaside town to call out the lifeboat crew. The rocket exploded, giving out light at the same time. Would someone nearby hear the bang first or see the flash?
See the flash first as light travels faster than sound.
What is the light ray that hits the mirror called?
The incident ray
What is the light ray that bounces off the mirror called?
The reflected ray
