1) Some atomic nuclei are unstable, the nucleus gives out radiation as it changes to become more stable. What is this called? a) Radioactive decay b) Radioactive contamination c) Radioactive accumulation d) Radioactive instability 2) Radioactive decay is measured by a... a) Pascal probe b) Geiger counter c) Kurt Geiger d) Alpha alarm 3) Activity is the rate at which a source of unstable nuclei decay that is measured in... a) Geigers b) Pascals c) Degrees d) Becquerels 4) Which of these describe alpha particles (α) ? a) ...this consists of two neutrons and two protons, it is the same as a helium nucleus b) ...a high speed electron ejected from the nucleus as a neutron turns into a proton c) ...electromagnetic radiation from the nucleus d) a neutron (n). 5) Which of these describe beta particles (β) ? a) ... a neutron (n) b) ...a high speed electron ejected from the nucleus as a neutron turns into a proton c) ...electromagnetic radiation from the nucleus d) ...this consists of two neutrons and two protons, it is the same as a helium nucleus 6) Which of these describe gamma particles (γ) ? a) ... a neutron (n) b) ..electromagnetic radiation from the nucleus c) ...a high speed electron ejected from the nucleus as a neutron turns into a proton d) ...this consists of two neutrons and two protons, it is the same as a helium nucleus 7) Can be stopped by paper... a) Alpha b) Gamma c) Beta d) Neutron 8) Can be stopped by aluminium... a) Beta b) Gamma c) Alpha d) Neutron 9) Can be stopped by lead... a) Neutron b) Gamma c) Alpha d) Beta

AQA Combined Radioactivity Year 10

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