Time Period The time for a particle to complete one full vibration or the time for one wave to pass a point. Luminous An object which emits its own light Non Luminous An object which does not emit its own light. It reflects light Dispersion White light contains seven colours. Each colour travels at a different speed in glass and so refracts by a different amount. Red refracts the least and violet refracts the most. This gives a spectrum of white light Principle of Conservation of Energy Energy cannot be created or destroyed; it can only be changed from one form into another. Renewable Energy Sources Energy resources which can be replaced in less than one human lifetime (70 yrs) Non-Renewable Energy Sources Energy resources which are used up quicker than they can be replaced. Or Energy resources which take longer than a human lifetime to replace Fossil Fuels Made from the remains of dead plants and animals which have decayed and been compressed... [continues]
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