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Physics P1 2 & 3

Physics revision

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