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Half-life describes a statistical pattern - Paper 2

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Supplied count-rate model: initial source count rate after background subtraction 720 counts/minute; half-life 2 minutes. Constant background 18 counts/minute must be added to predict detector totals. Use average ideal behaviour; individual decays are random. No radioactive source handling is requested.

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