accept equals or for 1 mark 42He 42α an particle is a helium nucleus is insufficient for this mark 1 [8] (i) splitting of a(n atomic) nucleus M9.(a) do not accept splitting an atom 1 (ii) Neutron 1 (b) (i) nuclei have the same charge or nuclei are positive accept protons have the same charge 1 (ii) (main sequence) star accept Sun or any correctly named star accept red (super) giant 1 (c) (i) any two from: easy to obtain / extract • available in (very) large amounts • releases more energy (per kg) • do not accept figures only produces little / no radioactive waste. • naturally occurring is insufficient seawater is renewable is insufficient less cost is insufficient 2 (ii) any one from: accept any sensible suggestion makes another source of energy available • increases supply of electricity • able to meet global demand • less environmental damage • accept a specific example reduces amount of other fuels used. • accept a specific example 1
accept equals 42He or 42α for 1 mark an particle is a helium nucleus is insufficient for this mark 1 [8] M9.(a) (i) splitting of a(n atomic) nucleus do not accept splitting an atom 1 (ii) Neutron 1 (b) (i) nuclei have the same charge or nuclei are positive accept protons have the same charge 1 (ii) (main sequence) star accept Sun or any correctly named star accept red (super) giant 1 (c) (i) any two from: • easy to obtain / extract • available in (very) large amounts • releases more energy (per kg) do not accept figures only • produces little / no radioactive waste. naturally occurring is insufficient seawater is renewable is insufficient less cost is insufficient 2 (ii) any one from: accept any sensible suggestion • makes another source of energy available • increases supply of electricity • able to meet global demand • less environmental damage accept a specific example • reduces amount of other fuels used. accept a specific example 1
p7_radioactivity_mark_scheme.docx