Heat Radiation

Question 1

How is heat radiated?

Answer 1

As infrared waves. These are electromagnetic waves that travel in straight lines a the speed of light

Question 2

Radiation is different from conduction and convection in several ways. Explain those ways

Answer 2

1. It doesn’t need a medium to travel through so it can occur in a vacuum, like space. This is the only way that heat reaches us from the sun
2. It can only occur through transparent substances, like air, glass and water
3. The amount of radiation emitted or absorbed by an object depends to a large extent on its surface colour and texture

Question 3

Matt black surface are good what?

Answer 3

They’re good absorbers and emitters of radiation.

Question 4

Light coloured, smooth and shiny objects are what?

Answer 4

They’re very poor absorbers and emitters of radiation. The reflect heat radiation

Question 5

What is radiation?

Answer 5

It’s how we get heat from the sun