continuous interchange of KE and gpe. KE (and gpe) reduce over a number of swings as energy is dissipated to the surroundings due to friction. the answer communicates ideas clearly and coherently uses a  range of scientific terminology accurately spelling, punctuation and grammar are used with few errors  Q19. Answer Acceptable answers Mark (a)(i) Any two of: Gamma is a wave Reverse arguments em (2) (1) radiation Gamma has no Alpha is a helium nucleus (1) charge Alpha is charged (1) Gamma has no mass Alpha has a mass (1) examples of penetrating power Gamma penetrates further/ alpha highly ionising ignore highly (1) vague comments eg Gamma weakly ionising (1) stronger Gamma travels faster (1) Ignore uses and dangers (b)(i) D (1) (b)(ii) B (1) (c) An explanation linking: do not allow positive electron (2) electron(s) (1) is/are lost/gained knocked off / removed/ (1) released Indicative Content Mark QWC *(d) An explanation including some of the following points: Radiation from the front of the lens Alpha particles absorbed by glass Beta particles do not penetrate glass Gamma rays pass through glass Background (6) radiation varies There is a large difference in size between front and back counts Radiation detected is gamma rays only Radiation from side of the lens Alpha particles cannot penetrate aluminium Beta particles are
continuous interchange of KE and gpe. KE (and gpe) reduce over a number of swings as energy is dissipated to the surroundings due to friction.  the answer communicates ideas clearly and coherently uses a range of scientific terminology accurately  spelling, punctuation and grammar are used with few errors Q19. Answer Acceptable answers Mark (a)(i) Any two of: Gamma is a wave (1) Alpha is a helium nucleus (1) Alpha is charged (1) Alpha has a mass (1) Gamma penetrates further/ highly (1) Gamma weakly ionising (1) Gamma travels faster (1) Reverse arguments em radiation Gamma has no charge Gamma has no mass examples of penetrating power alpha highly ionising ignore vague comments eg stronger Ignore uses and dangers (2) (b)(i) D (1) (b)(ii) B (1) (c) An explanation linking: electron(s) (1) is/are lost/gained (1) do not allow positive electron knocked off / removed/ released (2) Indicative Content Mark QWC *(d) An explanation including some of the following points: Radiation from the front of the lens Alpha particles absorbed by glass Beta particles do not penetrate glass Gamma rays pass through glass Background radiation varies There is a large difference in size between front and back counts Radiation detected is gamma rays only Radiation from side of the lens Alpha particles cannot penetrate aluminium Beta particles are (6)
p2_revision_pack_mark_scheme.docx