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Radiation P1
| Question | Answer |
|---|---|
| What are the three methods of heat transfer? | • Conduction • Convection • Radiation |
| What are the main transfer methods through: a) Solids b) Liquids and gases? | a) Conduction b) Convection |
| What is the link between temperature difference and rate of energy transfer? | The bigger the temperature difference between and object and its surroundings the faster the rate of transfer of heat energy |
| What happens to the rate of transfer if an object is: a) Hotter than its surroundings b) Cooler than its surroundings? | a) The faster the rate of transfer of heat energy b) The slower the rate of transfer of heat energy |
| Why? | Because if an object is hotter, it radiates more radiation than if its cooler. |
| Why is matt black a good colour to use for some appliances? | Because it absorbs and emits radiation better than shiny surfaces |
| What is a use of matt black surfaces? Explain why. | Solar hot water panels with water pipes on a black surface absorb radiation to heat water in pipes, then pumped around the radiators etc. |
| Why are silver, shiny surfaces useful in some appliances? | Because they reflect the radiation falling on them |
| Give a use of shiny surfaces and explain why its useful. | Vacuum flasks have silver shiny surfaces on the inside of them to keep heat in or out depending whether they are holding hot or cold water |
Created by:
GuyBrazier
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