Physics 0.0 / 5 ? PhysicsPhysicsGCSEOCR Created by: TamzinelliseCreated on: 25-05-16 10:19 What's the difference between heat & temperature? Heat is a measure of energy, temperature is a measure of hotness. 1 of 24 How do you work out energy? Energy = Mass x SHC x Temperature Change 2 of 24 What is Specific Latent Heat? The energy needed to change state 3 of 24 What's conduction? When vibrating particles pass energy on to nearby particles. 4 of 24 What's convection? When particles move to a cooler region with their energy. 5 of 24 What objects emit and absorb heat radiation? All of them - especially matte black surfaces 6 of 24 How can you insulate your home? Loft insulation, water tank jackets, thick curtains, double glazing, cavity walls & insulation, draught proofing. 7 of 24 How do you calculate efficiency? Efficiency = Useful Energy Output / Total Energy Input (x100%) 8 of 24 What represents the amount of energy in a sankey diagram? The thickness of the arrow. 9 of 24 How do you calculate wave speed? Speed (m/s) = Frequency (Hz) x Wavelenght (m) 10 of 24 What is the law of reflection? Angle of incidence = Angle of reflection 11 of 24 What's diffraction? Waves spreading out 12 of 24 What's refraction? Changing the speed of a wave which changes the direction 13 of 24 What are the 7 types of EM waves? Radio Waves - Microwaves - Infrared - Visible Light - Ultra Violet - X-Rays - Gamma Rays 14 of 24 What ways can you communicate with light? Morse code or optical fibres 15 of 24 What kind of light do lasers produce? Monochromatic 16 of 24 What are the uses for infrared around the home? Cooking, Remote Controls, Short-distance Information, Security Systems, Optical Fibres 17 of 24 How do radio waves travel? They can travel through the atmosphere as they have long wavelengths and they refract/diffract 18 of 24 What are the uses of microwaves? Cooking, Satellite Communication & Mobile Phones 19 of 24 How do EM receivers work? The size of the receiver depends on the size of the wave. Telescopes detect different types of wave 20 of 24 What's the difference between analogue & digital signals? Analogues have a range of values but digital only have two. 21 of 24 What's the problem with UV Radiation? It causes skin cancer so the ozone protects us from the UV of the sun. 22 of 24 What is the difference between P&S Waves? P waves are longitudinal (they travel along the wave) S waves are tranSverse (they travel at right angles to the wave) 23 of 24 What does a seismograph do? Tells us where P waves & S waves are inside the Earth 24 of 24
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