Radiation Flashcards
What objects emit radiation?
Any object will emit heat radiation
What form is heat moved in?
Electromagnetic waves
Like light
How does radiation effect temperature?
The hotter an object is, more radiation emitted
What colors absorb heat?
Dark and matt
What colors reflect radiation?
Lights and shiny
Can radiation travel through a vacuum?
Yes
Otherwise no heat from sun
How does an object achieve thermal equilibrium?
Absorb/emit
Frosty nights are usually clear.
Clouds absorb rays from the sun
No absorption means heat is reflected back into space
Shiny teapot will keep tea warm.
Heat is reflected back into the
Matt would absorb heat and conducted into air
Why is a vacuum flask so effective?
Glass bottle double walled with vacuum
Stops conduction and convection through sides
Walls silvered to keep radiation minimal
Stopper made of plastic and filled with cork to reduce heat loss (conduction)
