Light Flashcards
(15 cards)
Light travels at a finite but very high speed. It must always travel in what?
Light always travels in straight lines.
How are shadows formed?
Shadows are formed when something is opaque and blocks the light from passing through it. This causes a patch of land with no light being cast on it.
What does luminous mean?
Luminous means something that produces its own light.
What does non-luminous mean?
Non-luminous means something that does not produce its own light.
How are non-luminous objects seen?
Non-luminous objects can be seen because light scattered from the object enters the human eye.
What are the three primary colours?
The primary colours are:
- red
- blue
- green
When dispersed what does white light form?
A spectrum of colours.
How fast does light travel?
Give your answer in m/s (metres per second).
Light travels at a speed of 300,000,000 m/s.
What type of wave is light?
Light is a transverse wave.
Is a cat luminous or non-luminous?
Non-luminous
Is a torch luminous or non-luminous?
Luminous
Is the Moon luminous or non-luminous?
Non-luminous
How long does it take for light from the Sun to reach the Earth?
8 minutes
How fast does light travel?
Give your answer in mph (miles per hour).
671,080,888 mph
How fast does light travel?
Give your answer in km/h (kilometres per hour).
1,080,000,000 km/h
