AQA Physics Paper 1 Exam Questions And Answers Verified 100% Correct

AQA Physics Paper 1 Exam Questions And Answers Verified 100% Correct conservation of mass - ANSWER the principle stating that matter is not created or destroyed during a chemical reaction physical change - ANSWER A change in a substance that does not involve a change in the identity of the substance latent heat - ANSWER the energy absorbed or released during a change in state Specific Latent Heat - ANSWER Amount of heat needed to change the state of 1 kilo of a substance WITHOUT a change in temperature. specific latent heat equation - ANSWER energy = mass x specific latent heat specific latent heat of fusion - ANSWER the energy needed to change a unit mass from the solid to the liquid phase at constant temperature specific latent heat of vaporisation - ANSWER the energy needed to change a unit mass from the liquid to the vapour phase at constant temperature Pressure equation - ANSWER P=F/A pressure change in liquids - ANSWER pressure increases as you go deeper because you have more liquid pushing down from above. the greater the density the greater the pressure Unit of pressure - ANSWER Pascals, Pa OR Newtons per metre squared, N/m^2 upthrust - ANSWER A force that pushes things up in liquids and gases. sinking - ANSWER weight > upthrust nucleus - ANSWER the center of an atom mass number - ANSWER the sum of the number of neutrons and protons in an atomic nucleus isotopes - ANSWER atoms of the same element that have different numbers of neutrons why atoms are radioactive - ANSWER they have too many neutrons and become unstable. alpha radiation - ANSWER 2 protons and 2 neutrons alpha calculations - ANSWER mass number -4 proton number -2 beta radiation - ANSWER fast-moving electrons beta calculations - ANSWER mass number 0 proton number +1 gamma radiation - ANSWER electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength ion - ANSWER atom that has a positive or negative charge order of ionising power from most to least - ANSWER alpha > beta > gamma penetrating power alpha - ANSWER sheet of paper, couple of cm penetrating power beta - ANSWER aluminium penetrating power gamma - ANSWER thick lead or concrete use of alpha radiation - ANSWER smoke alarm uses of beta radiation - ANSWER making paper and aluminium the right thickness half-life - ANSWER the period of time in which half of a radioactive substance decays uses if gamma radiation - ANSWER find leaks in pipes carbon dating - ANSWER a scientific method used to determine the age of an artifact Plum Pudding Model - ANSWER The model of an atom in which there is a positively charged ball with electrons dotted through it. Ernst Rutherford - ANSWER Gold foil experiment. Most alpha particles passed straight through but some were deflected a little and a lot disproving the plum pudding model. background radiation - ANSWER nuclear radiation that occurs naturally in the environment Sources of background radiation - ANSWER Radon gas, cosmic rays, rocks, building materials, medical x-rays, food, nuclear industry nuclear fission - ANSWER nuclei of isotopes split apart when struck by neutrons produces a large amount of energy. sound energy - ANSWER Energy caused by an object's vibrations thermal energy - ANSWER The total energy of motion in the particles of a substance chemical energy - ANSWER A form of potential energy that is stored in chemical bonds between atoms. nuclear energy - ANSWER the potential energy stored in the nucleus of an atom electrical energy - ANSWER Energy caused by the movement of electrons. light energy - ANSWER Energy in the form of moving waves of light kinetic energy - ANSWER energy of motion gravitional potential energy - ANSWER potential energy that depends on the height of an object elastic potential energy - ANSWER the energy of stretched or compressed objects conservation of energy - ANSWER law that says energy cannot be created or destroyed, but can change forms