Bbn Phy 1.12

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Physics 1 Unit P1.5 The use of waves for communication and to provide evidence that the universe is expanding * Know and understand that electromagnetic radiations travel as waves and move energy from one place to another. * Know that these radiations can all travel through a vacuum and do so at the same speed. * Know and understand that waves cover a continuous range of wavelengths called the electromagnetic spectrum. * Know that and understand that sound waves and some mechanical waves are longitudinal, and cannot travel through a vacuum. * Know that current evidence suggests that the universe is expanding and that matter and space expanded violently and rapidly from a very small initial ‘point’, ie the universe began with a ‘big bang’. * You are expected to use your skills, knowledge and understanding to: * compare the use of different types of waves for communication, * your expected knowledge and understanding of waves used for communication is limited to sound, light, microwaves, radio waves and infrared waves. * evaluate the possible risks involving the use of mobile phones, * and consider the limitations of the model that scientists use to explain how the universe began and why the universe continues to expand. AQA GCSE Science PHYSICS Unit P1.5.1 General properties of waves * a) Know and understand that waves transfer energy. * b) Know and understand that waves may be either transverse or longitudinal. * You need to understand that in a transverse wave the oscillations are perpendicular to the direction of energy transfer, but in a longitudinal wave the oscillations are parallel to the direction of energy transfer ie direction of forward wave movement. * Shaking a slinky spring from side to side produces a transverse wave, as ripples on water. * Pulling and pushing on a
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