Light KS3

Flashcards by Lauren Pereira-Greene, updated more than 1 year ago
 Created by Lauren Pereira-Greene almost 6 years ago
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GCSE Science (Physics) Flashcards on Light KS3, created by Lauren Pereira-Greene on 05/26/2015.

Resource summary

 Question Answer How does light travel? Light travels in straight lines How can travelling light be represented? Rays (straight line, touching source with an arrow to show direction) What is the relationship between the speed of light and the speed of sound? Light travels faster than sound What is a luminous object? Give examples. A luminous object is an object that gives out light. E.g. a light bulb, a burning candle, the Sun What is a non-luminous object? Give examples. A non-luminous object is an object that does not give out light, although it can still reflect light from other sources. E.g the Moon, the Earth, humans, a chair etc. Incident ray The incident ray is the light going towards the mirror Reflected ray The reflected ray is the light coming away from the mirror Normal The normal is drawn at 90° to the surface of the mirror The angle of incidence The angle of incidence is the angle between the normal and incident ray The angle of reflection The angle of reflection is the angle between the normal and reflected ray The law of reflection The law of reflection states that the angle of incidence equals the angle of reflection Refraction Light waves change speed when they pass across the boundary between two substances with different densities, such as air and glass. This causes them to change direction and this effect is called refraction. Dispersion The separation of white light into colours or of any radiation according to wavelength. Primary colours Red, green and blue. Primary colours of light add together to make white light, or secondary colours Secondary colours Magenta, cyan and yellow. Explain how coloured objects appear in white light and in different colours of light When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. For example, a blue object absorbs all the colours of the spectrum except blue: it reflects blue light.

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