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Cambridge IGCSE. 2025. Physics (0625). May/June - Paper 2 (22) · Multiple Choice (Extended) - Question 35

Cambridge IGCSE · Paper 2 (22) · Multiple Choice (Extended)

Question 35

A detector near a radioactive source shows a reading of 2000 counts/minute.

How is the corrected count rate determined?
  1. by moving the detector closer to the source
  2. by placing an absorber between the detector and the source
  3. by repeating and averaging the measurements
  4. by taking away the background radiation count rate
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