Physics revision P1 0.0 / 5 ? PhysicsGCSEAQA Created by: Sarah LlewellynCreated on: 22-04-13 18:46 What is thermal energy? Heat energy 1 of 22 How can the rate of heat transfer get slowed down? Heat transfer can be slowed down by the use of INSULATION, which provides a barrior 2 of 22 which of these emits more radiation? 1.light shiny surfaces 2. dark matt surfaces? 2. dark matt surfaces, becuase they also absorb more radiation 3 of 22 what are good reflectors of infrared radiation? light shiny surfaces 4 of 22 Conduction Conduction is the transfer of heat energy withought the substance itself moving 5 of 22 Convection Convection is the transfer of heat energy through movement. This occurs in liquids and gases and creates convection currents 6 of 22 Condensation When a warm gas comes in contact with a cold surface e.g water vapour in breath condensing on a window 7 of 22 Evaporation A liquid evaporates when its particules have gained enough energy to escape the surface of a liquid and becomes a gas 8 of 22 Longitudinal wave The oscillations are parallel to the direction of energy transfer -- - -- 9 of 22 Compressions (longitudinal waves) Places where the particules are bunched together are called compressions 10 of 22 rarefactions (longitudinal waves) places where the particules are spread apart are called rarefactions 11 of 22 Transverse wave The oscillations are perpendiculr to the direction of the energy transfer ~~~~ 12 of 22 Wavelength the length of one complete wave, measured in meters (m). 13 of 22 Amplitude The height from the middle of the wave to the top 14 of 22 Trough bottom of a wave 15 of 22 Peak top of a wave 16 of 22 Wave speed how quickly the energy mass moves, measured in metres per second (m/s) 17 of 22 Frequency How many waves pass a fixed point in a second, measured in hertz (Hz) 18 of 22 The wave equation Speed = frequency *times Wavelength 19 of 22 Electromagnetic wave formula wave speed = frequency *times wavelength 20 of 22 elctromagnetic spectrum Radiowaves, Microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays 21 of 22 What type of waves are water waves? transverse waves 22 of 22
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