Physics P1.1 energy transfer by heating
- Created by: danielle9449
- Created on: 28-05-16 15:57
Physics P1.1 energy transfer by heating
Infrared radiation
Infrared radiation is energy transfer by electromagnetic waves
All objects emit infrared radiation
The hotter the object the more infrared radiation it emits in a given time
Dark, matt objects are good absorbers of infrared radiation
Dark, matt objects are good emitters of infrared radiation
Light, shiny objects are poor absorbers of infrared radiation
Light, shiny objects are good reflectors of infrared radiation
Sates of matter
Flow, shape, volume and density are the properties used to describe each state of matter
The particles in a solid are held next to each other in fixed positions
The particles in a liquid move about at random and are in contact with each other
The particles in a gas move about randomly and are much further apart than particles in a solid or liquid.
Conduction
Metals are the best conductors of energy
Materials such as wool and fibreglass are the best insulators
Conduction of energy in a metal is due mainly to free electrons transferring energy inside the metal
Non-metals are poor conductors because they do not contain free electrons.
All atoms are vibrating a small amount
These vibrations are passed on from atom to atom by collision
All ions are vibrating a small amount
These vibrations are passed on from…
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