Fission, Fusion, and Radioactivity MCQ 1
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Questions and Answers

What is the charge of an alpha particle?

  • Positive (correct)
  • No charge
  • Negative
  • Variable

What is the process of a nucleus breaking up with the release of radiation?

  • Nuclear fusion
  • Nuclear fission
  • Radioactive decay (correct)
  • Ionisation

What is the unit of activity of a radioactive source?

  • Curie
  • Becquerel (correct)
  • Seivert
  • Rutherford

What is the equation that relates energy and mass?

<p>E=mc^2 (C)</p> Signup and view all the answers

What is the process by which a neutral atom gains or loses electrons?

<p>Ionisation (C)</p> Signup and view all the answers

What is the half-life of a radioactive isotope?

<p>The time taken for half of the nuclei in a sample to decay (C)</p> Signup and view all the answers

What is the type of radiation that is the emission of high-energy photons from an unstable nucleus?

<p>Gamma radiation (B)</p> Signup and view all the answers

What is the process by which two small nuclei combine to form a single larger nucleus?

<p>Nuclear fusion (C)</p> Signup and view all the answers

What is the main conclusion drawn from Rutherford's gold foil experiment?

<p>Atoms are made up of mostly empty space with a dense positive core (B)</p> Signup and view all the answers

What is the composition of the nucleus according to Niels Bohr's model?

<p>Tiny solid protons and neutrons (D)</p> Signup and view all the answers

What happens when electrons fall back to a lower energy state after being given energy?

<p>They emit a fixed 'quantum' of energy (B)</p> Signup and view all the answers

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