Physics 1a Flashcards
(24 cards)
What are the 3 different ways heat is travelled in
conduction
convection
heat radiation
What is a solid travelled in
conduction
What is a liquid and gases travelled in
convection
What is best radiation travelled in
infrared radiation
What is infrared radiation
giving out electromagnetic waves
What do all objects do with infrared radiation
all objects give out and absorb radiation
the hotter an object …
more infrared radiation it gives out
the object hotter than it’s surrounding…
gives out more radiation then cools down
the object cooler than it’s surroundings…
absorbs more radiation than it emits as it warms up
What does radiation depend on
surface colour and texture
what is a good absorber and good emitter or radiation
dark matte black surfaces
What are poor absorbers and poor emitters or infrared radition
light shiny surfaces
What are light shiny surfaces good for
good reflectors
What is radiation from the sun absorbed by
black surface to heat up water pipes
What can water in pipes be used for
washing or pumped into radiators to heat the building
What are examples of solid liquid and gas
solid = ice liquid = water gas = water vapour
What are the 3 points about a solid
- strong force of attraction
- PARTICLES are arranged in a pattern
- PARTICLES don’t have alot of energy so only vibrate a little
3 points about a liquid
weaker force of attraction
particles are close together but can move past eachother
more energy than a solid and move in all directions at a low speed
3 points about gases
- No force of attraction
- PARTICLES have more energy than liquid or gas
- free to move in any direction and at any high speed
Where does conduction of heat mainly happen
solids
What is conduction of heat
Is where vibrating particles pass on their energy to the particles next to them
What are materials with particles close together
conductors
What does it mean when materials with particles are close together
bang into eachother and pass energy quickly between them
What do materials called with large spaces between their particles
conduct heat much slower and are insulators
