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KS Physics
Physics F3
Question | Answer |
---|---|
What are the 3 Gas Laws | Charles' Law, Pressure Law, Boyle's Law |
What is Charles' Law? | Volume is directly proportional to temperature. When temperature increases, the volume of particles increase. V α T |
What is Pressure Law? | Volume is directly proportional to Pressure. When temperature increases, the pressure of particles increase, if volume remains constant. V α P |
What is Boyle's Law? | Volume is inversely proportional to pressure. When volume decreases, the pressure increases. V α 1/P |
Name the 3 methods of heat transfer. | Convection, Conduction, and Radiation |
Why will sitting in a cold bath cool your body down? | Heat from body transfers into water, causing cold water to heat up and your body to cool down. Convection takes place. |
What is Convection? | The up and down movement of gases and liquids caused by heat transfer. |
What is Conduction? | The transfer of heat via kinetic energy between substances in direct contact with one another. |
What is Radiation? | The transfer of heat in the form of electromagnetic waves. Matter is not required. |
Why are metals good conductors? | Because they contain free or loose electrons in their outer shells allowing them to shift easily from atom to atom. They have low resistivity, allowing heat to pass through. |
What is diffusion? | The movement of particles in a fluid from a region of high concentration to a region of low concentration. |
What is osmosis? | The diffusion of water through a semi-permeable membrane. |
What is capillarity? | The force which causes water to rise to a higher level in narrower tubes. |
How does heat energy radiated by a body depend on its temperature? | When the temperature of a body is heated, its particles move about and generates energy which causes the body to become hot. |
How does heat energy from the sun reach the Earth? | Electromagnetic radiation. |
Which surfaces are better emitters and absorbers of radiation? | Dark and/or rough surfaces. |
Why will a silver shiny teapot keep tea hot for longer than a dull brown one? | Shiny surfaces reflect heat that is emitted from the tea to keep the heat inside the teapot, whereas a dull brown teapot will absorb the heat and cause it to leave the teapot thereby cooling down the tea. |
What is kinetic energy? | Energy that a body has because it is moving. |
What is latent heat of fusion? | The heat absorbed during the melting process. |
What is latent heat of vaporization? | The heat needed to convert a liquid into a gas. |
What is specific latent heat of fusion? | The heat required to convert 1 kg of a substance at a fixed temperature, usually its melting point, from solid to liquid state |
What is specific latent heat of vaporization? | The heat required to convert 1 kg of a substance at a fixed temperature, usually its boiling point at 1 atmosphere pressure, from liquid to gaseous vapour state. |