CCR - Conduction, Convection, Radiation

Question 1

Good conductor (bad insulator) examples

Answer 1

Metals

Question 2

Good insulator (bad conductor) examples

Answer 2

• plastic
• glass
• wood

Question 3

How does thermal conduction happen in non-metals

Answer 3

heat causes atoms in the lattice to vibrate faster. These vibrations spread through the material, transferring heat

Question 4

How does thermal conduction happen in metals

Answer 4

Delocalised electrons carry heat by moving faster when heated, transferring energy throughout the metal.

Question 5

Convection

Answer 5

process of heat transfer in fluids (liquids and gases) where warm, less dense areas/particles rise, and cooler, denser areas/particles sink, creating a circular motion

Question 6

What is thermal radiation and how does it transfer energy?

Answer 6

Thermal radiation transfers energy without needing a medium. It mainly happens through infrared radiation

Question 7

How do surface color and texture affect thermal radiation?

Answer 7

Black surfaces - absorb and emit more thermal radiation than white surfaces.
White surfaces - reflect more thermal radiation and absorb less.
Dull surfaces - absorb and emit more thermal radiation, while shiny surfaces reflect more and absorb less.

Question 8

How does the temperature of the Earth change?

Answer 8

The temperature of the Earth is affected by radiation absorbed by the Earth from the Sun and radiation emitted by the Earth back into space.

Question 9

How can you tell which materials are good emitters of thermal radiation?

Answer 9

Conduct an experiment where you heat different materials and observe how quickly they cool down. Materials that cool down faster are good emitters of thermal radiation.

Question 10

How can you tell which materials are good absorbers of thermal radiation?

Answer 10

In an experiment, shine light on different materials and measure how much the temperature increases. Materials that heat up more quickly are good absorbers of thermal radiation.

Question 11

What are some examples of everyday applications of conduction, convection, and radiation?

Answer 11

Conduction: A metal spoon heating up in a hot cup of tea.
Convection: The warm air rising from a heater and circulating around the room.
Radiation: Feeling the warmth of the Sun on your skin.