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Light and Sound KS3

KS3 Science revision of light and sound

Light travels in straight lines
Light travels as a type of electromagnetic radiation
Light travels at a speed that is much faster than the speed of sound
The speed of light in a vacuum is 300,000,000 m/s
A window is transparent
The sun is luminous
The moon is shiny
Air is transparent
Water is translucent
A carpet is opaque
What must be true about an object if it is going to cause shadows? It is opaque - it must block some or all of the light falling on it
What fact about the way light travels explains why shadows are made? Light travels forwards in straight lines
When a ray of light hits a surface what TWO things happen? 1. Reflection of light 2. Transmission of light
Light from the sun and light bulbs is called? White light
How many main colours are there making up sunlight? Seven
How are different colours caused? By light waves having different frequencies and wavelengths
How can light be split into its colours? By using a prism
What is it called when light is split into its colours? Dispersion
What is the pattern of colours called -scientific term? A spectrum
What are the primary colours? Red, green and blue
Created by: frauclooney