P2.2.5 - Energy transfer: radiation Flashcards
The hotter an obect is…
the more infrared radiation it is emitting.
What does ‘emit’ mean?
Give out
Infrared radiation travels as a…
wave
Which colour clothing should be worn in hot conditions and why?
White or shiny because the infrared radiation (hea) will be reflected and keep you cool
All hot objects emit…
infrared radiation
How do white and shiny surfaces react to infrared radiation?
They are poor absorbers (reflectors) so…
They are poor emitters.
How do black objects react to infrared radiation?
They are good absorbers so…
They are good emitters too
What can we use to ‘see’ infrared radiation?
Thermal Imaging Camera
How is thermal energy transfer via infrared different to energy transfer via conduction and convection?
Infrared radiation does not require particles
Infrared radiation can travel through a vacuum
Why are marathon runners given a shiny blanket at the end of a race?
They’re body temperature drops quickly.
The shiny surface reflects infrared back ontp their body to reduce the temperature drop.
Why shouldn’t you wear black clothing in hot sunny weather?
Because your clothing will absorb infrared radiation and keep make you too warm.
infrared radiation can sometimes be called…
thermal radiation
