What is thermal radiation?

Transfer of energy by infrared waves

What does absorption mean?

Taking in thermal energy

What does emission mean?

Giving out thermal energy

Which surface is the best emitter of IR radiation?

Dull black

Which surface is the poorest absorber of IR radiation?

Shiny metal

Why does radiation not need particles?

Because it travels as infrared waves

Why is a shiny blanket used after a race?

It reflects IR radiation back to the runner

Why are houses in hot countries white?

White surfaces absorb little IR radiation

Which can cools fastest in the emission experiment?

Matte black can

Why does the matte black can cool fastest?

It emits IR radiation most effectively

What does a vacuum prevent?

Conduction and convection

Why are the flask walls shiny?

They reflect IR radiation

Why are fridge pipes painted black?

Black surfaces emit IR radiation well

What does a heat sink use to transfer heat?

Conduction

What does a thermogram show?

Temperature differences using colour