Aqa Physics Paper 2 Study Guide Rated A+

wavelength {Ans: the distance from peak to peak or trough to trough}speed of light {Ans: 3 x 10⁸ m/s}factors that may affect thinking distance (and thus stopping distance too) {Ans: fog, tiredness, alcohol, needing the toilet, distractions (e.g. phone), drugs, light level, reaction time}White dwarf {Ans: A star of a similar size to the sun would become unstable and eject its outer layer of dust and gas - it leaves behind a hot, dense, solid core - this}liquid pressure {Ans: this depends also on depth and density, as: 1. the more dense the liquid is, the more collisions happen 2. the more depth there is, the more particles there are above any given point, so the pressure from above increases as we go deeper so: p = h X ρ X g (pressure in Pa) = (depth/height in m) X (density in kg/m³) X (gravitational field strength in N/kg (9.81 on Earth))}dynamos (DC) {Ans: generate direct current - they have split ring commutators, which swaps the current every half turn to keep the current flowing in the same direction}