Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

The half-life of lead-202 is 52 500 years. A lead-202 sample gives a count rate of 800 counts/s. How long will it take for the counting rate to fall to 100 counts/s?

  • A105 000 years
  • B157 500 years
  • C210 000 years
  • D420 000 years

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