Energy transfer 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: georgieh11Created on: 01-06-15 16:38 What is the best colour for a central heating radiator, glossy white or dull black? Dull black 1 of 16 Why does a solid have a fixed volume? Because the particles are held together in fixed positions. 2 of 16 When a liquid evaporates, why does the average kinetic energy of the remaining molecules reduce? The most energetic molecules leave the liquid. 3 of 16 What happens to the rate of energy transfer between an object and its surroundings if the temperature difference between them is reduced? The rate of energy transfer decreases. 4 of 16 Which types of energy transfer involves particles? Conduction, convection and evaporation involve particles. 5 of 16 How does energy from the sun reach the earth? Energy from the sun reaches the earth as radiation that travels through space. 6 of 16 How does the colour of a surface affect the rate of conduction? The colour of the surface has no effect on the rate of conduction. 7 of 16 Why are gases poor conductors? Gases are poor conductors because the particles are far apart. 8 of 16 Why are metals the best conductors? Metals are the best conductors because they have free electrons. 9 of 16 What is convection? Convection is the movement of energy through a fluid by movement of the fluid itself. 10 of 16 How does the cavity wall insulation reduce the energy transfer from a house? Cavity wall insulation traps the air in the cavity in pockets, preventing convection currents from being set up. 11 of 16 Why are the pipes on the back of a fridge usually painted black? Black surfaces are the best emitters of infrared radiation. 12 of 16 What is a vacuum? A region that doesn't contain anything at all, even gas particles. 13 of 16 What effect would decreasing the surface area of a liquid have on its rate of evaporation? It would decrease the rate of evaporation. 14 of 16 Why does a fluid become less dense when it's heated? It expands, so it is the same mass of material in a larger volume. 15 of 16 Why is fibreglass a good insulator? It contains trapped air. 16 of 16
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