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Light and Sound KS3
KS3 Science revision of light and sound
Question | Answer |
---|---|
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 |