Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: Energy Transfer by Heating

Questions and Answers List

level questions: Energy Transfer by Heating

QuestionAnswer
What happens when an Object is Heated? Give an Equation for Energy Transferred-This has the Energy being Transferred to the Thermal Energy Store of the Object, and the Temperature Energy Transferred = Mass x Specific Heat Capacity x Temperature Change
How can Heat Energy be Transferred?-Conduction -Convection -Radiation
What happens in Conduction?-When the Object is Heated, the Particles get an Increase of its Thermal Energy Store -This allows them to Vibrate even more, and having Collisions which Transferrers Their Kinetic Energy Store to the Neighbouring Particles Kinetic Energy Store -This keeps Happening, until the Energy has been Spread Out Evenly, and the Objects Temperature is the Same Everywhere -This can happen mainly in Solids, as the Particles are Next to Each other.
What is Thermal Conductivity? What's Metals and Liquids Conductivity?-This simply Describes how well an Object can Transfer Energy via Conduction -Metal has a High Thermal Conductivity -Liquids do Not have a High Conductivity [Low]
What happens in Convection?-When a Liquid or a Gas is Heated up, the Particles moves Faster and becomes Less Dense -Warmer Less Dense Fluid rises Up, past the Colder Denser Surroundings -This makes the Cooler Fluid fill up the Place that the Hot Fluid once was in, allowing it to all Repeat -This is a Convection Current -Keep in mind, the Warmer Particles will take their Kinetic Energy Store, and have it be Taken up
How can you Reduce Convection?-Simply making the Fluid stop Moving will reduce the Convection -Clothes, Blankets and Foam Cavity Wall Insulation will work as it Traps Pockets of Air. -Air not being able to Move means the Conduction will slow Down
What happens in Radiation?-Radiation, unlike Convection and Conduction, doesn't require any Particles so it can travel through Radiation -This Energy can be Transferred as Infra-Red Waves [And they can be Detected using a CT Scan]
-In terms of Absorption and Emitting, what happens if the Object is: -Cooler Object next to a Hotter Object -Matt Black Surfaces -Light-Coloured, Smooth and Shiny Objects-If a Hot Object is near a Cool Object, then the Thermal Energy Store of the Hot Object will Transfer some Energy via Infra Red to the Cool Object's Thermal Energy Store -Matt Black are very good Absorbers and Emitters -Light-Coloured, Smooth and Shiny Objects are Bad Absorbers and Emitters