Heat Radiation Flashcards
Which way does HEAT ENERGY flow?
From a HOTTER object to its COOLER SURROUNDINGS
Name the 3 types of ENERGY TRANSFER
RADIATION
CONDUCTION
CONVECTION
What is HEAT RADIATION?
It is the transfer of heat energy by infrared (IR) radiation
Which type(s) of energy transfer uses particles?
Conduction and convection
Which type(s) of energy transfer is/are most common in solids?
Conduction
Which type(s) of energy transfer is/are most common in liquids?
Convection
Which type(s) of energy transfer is/are most common in gases?
Convection
[ ] can be emitted by solids, liquids and gases
Infrared Radiation
Any object can both [ ] or [ ] IR radiation whether or not conduction or convection are also taking place
Absorb
Emit
The BIGGER the temperature difference between a body and its surroundings…
…the FASTER energy is transferred by heating.
What is IR radiation?
The emission of Electromagnetic Waves in the IR spectrum
All objects are continually emitting and absorbing [ ]
Infrared Radiation
Where is IR radiation emitted from?
The surface of an object
An objects that’s HOTTER than its surroundings…[ ]…than it absorbs (as it cools down)
Emits more radiation
An objects that’s COOLER than its surroundings…[ ]…than it emits (as it warms up)
Absorbs more radiation
The [ ] an object is, the MORE radiation it radiates in a given time
HOTTER
Radiation depends on …
… Surface colour and texture.
Which surface colour and texture emits and absorbs the most IR radiation?
Black and Matt
Which surface colour and texture emits and absorbs the least IR radiation?
Gloss white / Silver and shiny
Solar Hot Water Panels contain Water Pipes and are both [ ] , why?
Black
Radiation from the sun is absorbed by the black surface to heat the water in the pipes.
This water can be used for washing or radiators
