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3 marksParticles in the Atom

CSEC Physics · 1988 · Paper 2 · Question 3(a)(ii)

A diagram represents the structure of an atom.

State whether or not the atom is neutral and explain your answer. Then record the mass (nucleon) number of the atom.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 3(a)(i)Identify the components X, Y and Z labelled in the diagram.[3 marks]
  2. 3(a)(iii)Draw a similar diagram to represent an isotope of the atom in (ii), and record its mass (nucleon) number.[3 marks]
  3. 3(b)(i)Enter, above each arrow, the symbols for the radiations that are likely to be emitted.[4 marks]
  4. 3(b)(ii)If someone is exposed to all three radiations from the thorium source, which one do you think is most likely to cause the greatest harm? Explain your answer.[3 marks]
  5. 3(b)(iii)Calculate the half-life of a radioactive substance whose activity falls to 25% in 10 hours.[2 marks]
  6. 3(b)(iv)The activity of a substance falls from 3 000 Bq to 750 Bq in 10 hours. What is its activity after a further fifteen hours?[2 marks]

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