Aqa A Level Physics Paper 2 Exam Questions (143 Terms) With Verified Definitions Updated 2024

Activity {Ans: Number of nuclei of the isotope that disintegrate per second (i.e. the rate of change of the number of nuclei of the isotope). Measured in becquerels (Bq). 1Bq = 1 disintegration per second.}Alternator {Ans: Generator of AC.}Mass spectrometer {Ans: Device that separates a constituents of a substance by their masses.}Melting point {Ans: Temperature at which a substance melts.}Latent heat of vaporisation {Ans: Energy needed to evaporate a liquid at its boiling point.}Back emf {Ans: An emf generated in a motor that works against the current that is powering the motor.}Lenz's law {Ans: "The direction of the induced current is always such as to oppose the change that caused the current".}Deposition {Ans: Process where a gas turns directly into a solid.}Electrical conductor {Ans: Material with lots of free electrons. Can only be charged when isolated from the Earth.}Magnetic flux linkage {Ans: Product of the magnetic flux and the number of turns of the coil.}