Aqa A Level Thermal Physics

AQA A level Thermal nz nz nz


Physics nz


1. StateStudy
the online
first atlaw of thermodynamics and the equation.: The increase
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in internal energy of a system is equal to the heat energy added to the
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system minus the work done by the system.
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U = Q - W
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The increase in internal energy of a system is equal to the heat energy added
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to the system plus the work done on the system.
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2. What is meant by thermal equilibrium?: There is no net flow hermal
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of t between 2 objects once they are at the same
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temperature.
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3. Explain what happens to 2 gases at different temperatures when they
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are mixed and reach thermal equilibrium.: Hot gas molecules transfer
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energy to cold gas molecules when they collide until all molecules have the
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same average kinetic energy. Hot gas cools and cold gas heats up until they
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are at the same temperature.
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4. Why is energy needed to melt ice at 0°C to water at 0°C?: ergy of
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The en required to break some inter-molecular bonds increasing the the
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potential en molecules.
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5. Define specific heat capacity: The energy required to increase e
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th of 1kg of a substance by 1°C
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6. Define specific latent heat of vaporisation: The energy needed hange
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to c of a substance from a liquid to a gas with no change in
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temperature.
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7. Continuous flow method to find SHC: 1. Set p.d. (V), cyrrent (I) and
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flow rate (m/t), measure T
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2. change pd, alter flow rate until T is the same as before
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3. elec energy supplied per second = mc T per second + energy lost to
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surroundings per second
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4. VI = m/t c T + energy lost to surroundings per second
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5. Subtract simultaneous equations to eliminate the effects of heat loss
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6. V•I•-V‚I‚ = m•c T-m‚c T = c T(m•-m‚)
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7. c = (V•I•-V‚I‚)/ T(m•-m‚) where m is the mass of fluid passing through each
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, AQA A level Thermal
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Physics
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nzsecon
Study online at
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https://quizlet.com/_8dghkh
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