Waves Light Flashcards
What is the speed of light in the vacuum of space and give scientific notation
300 000 000 m/s
3x10*8
What is white light
Combination of all the colours in the spectrum
What are all the different colours in a spectrum
Red orange yellow green blue indigo violet
The whistle light splits into 7 what is this called and explain
Called dispersion
All the colours refRACt at different angles so a prism reveals all the spectrum colours.
What is refRACtion
The bending of light when it passes from one medium to another.
Why do different mediums cause refraction
They have different optical densities.
Why can refraction be dangerous
Apparent depth vs real depth
What is the law of reflection of light
The angle of incidence (i)= angle of reflection (r)
Why is ambulance written weird
Called
Explain
Laterally inverted so that readable in car mirror
What happens to light through glass/ water
Speed of it decreases because they’re denser
Speed of light through glass
2x10*8m/s
What is a light year
Distance that light can travel at normal speed for a year
What is light?
Transverse wave+particle/photon
What does light travel in
Straight lines
What does not radiate its own light
Name
Eg
Illuminated objects,they reflect
MOON house flowers
What emits its own light?
Luminous objects
Sun
Light bulb
What is a shadow
Dark area that blocks light
Reflected:
Absorbed:
Transmitted:
Light bounces off
Travels into
Through objects
Explain how we see light
Enter through pupil, strikes retina, converted to electrical nerve impulses travel to brain by optic nerve
Si unit for light intensity vector/scalar
Lux scalar
Luminous activity in a direction
Candela vector
What instrument used to mesure light intensity and what does it measure in
Light meter
Light hitting per second
What is a pinhole camera
Closed chamber with small hole in one side which creates an image of outside space on the opposite side where translucent screen is placed
Uses of reflection of light
Periscope
Optical fibre
Kaleidoscope
Endoscope
True false light always travels in straight lines
True
What is the speed of light in water
2.3x10*8m/s
