Thermal physics 0.0 / 5 PhysicsThermal physicsA2/A-levelAQA Created by: argyrouCreated on: 08-05-18 13:43 What are the 2 possible reasons why internal energy would be constant? -no energy transfer by heating so no work is done - energy transfer by heating and work done balance each other out 1 of 14 Define thermal equilibrium When 2 objects are at the same temperature so there is no change in internal energy 2 of 14 How would you work out temperature in Kelvin if given temperature in degrees? Temp in K= Temp in C + 273 3 of 14 What is absolute zero kelvin? the lowest possible temperature where an object at this temp would have minimum internal energy where volume and pressue is zero 4 of 14 Define specific heat capacity C energy needed to raise the temperature of unit mass of the substance by 1K without change of state 5 of 14 What is the equation for energy transferred when its temperature changes? _ Q=mC_ T 6 of 14 What is the equation for specific heat capacity used in the inversion tube experiment? C=gLN/_ T 7 of 14 what is the equation to find electrical energy supplied by a heater to heat a metal? E=ItV 8 of 14 Assuming no heat is lost to the surroundings, what equation would you use to find specific heat capacity using electrical methods? C=ItV/m_ T 9 of 14 Define specific latent heat of fusion Energy needed to change the state unit mass of the substance from solid to liquid without changing temperature 10 of 14 Define specific latent heat of vaporisation energy needed to change the state of unit mass of the substance from liquid to vapour without change of temperature 11 of 14 Define sublimation process of solids vaporising directly when heated 12 of 14 What equation would you use to calculate energy transferred when its state changes? Q=mL 13 of 14 What is the equation for power at a change in state point? p=mL/t 14 of 14

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