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Physics P1 2 & 3
Physics revision
| Question | Answer |
|---|---|
| Explain the difference between heat and temperature | Temperature is a measure of heat, heat is a measure of energy (on an absolute scale) |
| Why does a graph showing the temperature of a substance as it's heated have two flat bits? | This is when the energy is being used to change the state (break chemical bonds) rather than change the temperature |
| Describe the process that transfers heat energy through a metal rod. What is this called? | Particles gain more kinetic energy which they pass on to their neighbouring particles - conduction. |
| describe how heat from an immersion heater is transferred throughout water in a tank. What is this called? | Warmer, less dense fluid rises above colder, denser surroundings - convection. |
| Name 5 ways of reducing heat loss from a house | Loft insulation, hot water tank jacket, cavity wall insulation, daught-proofing, thick curtains, double glazing |
| What is refraction & how does it disrupt radio signals? | a change in direction for a wave; it bends the signal away from the receiver dish |
| Which is more dangerous - low or high freq. EM radiation? | Higher frequency, as they have more energy so they can kill living cells |
| How are lasers used in CD players? | pits cut into CD. a laser shines on CD & is reflected, a light sensor detects the differences in reflection between the lan & the pit: change = on, no change - off. differences are changed to an electrical signal, amplifier converts signal into sound. |
Created by:
queenkool
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