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2 marksRadioactivity

CAPE Physics Unit 2 · 2005 · Paper 1 · Question 9(b)(iii)

A radioactive source emitting alpha, beta and gamma radiation is placed in a magnetic field directed into the page. A Geiger-Muller tube moves along a circular path from position A to position B.

If the distance from the source to the Geiger-Muller tube is about 15 cm, alpha-particles cannot be detected. Explain why.

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Other parts of this question

  1. 9(a)(i)Beside EACH letter write the name of the parts labelled Q, S and T in Figure X.[3 marks]
  2. 9(a)(ii)Describe the principle of the operation of a G-M tube.[1 mark]
  3. 9(a)(iii)Explain why a mixture of argon and bromine gas is used in the tube.[2 marks]
  4. 9(b)(i)Identify the type of radiation recorded at position A.[1 mark]
  5. 9(b)(ii)Show on Figure XI the region where gamma radiation would be detected.[1 mark]

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