A-LevelPhysicsNuclear physics9702/12 · Oct/Nov 2010 · Q401 Mark
A counter recording radioactive decays from a radioactive source gives the following counts in equal intervals of time. [Table showing time/min and counts: 0-10: 424, 10-20: 395, 20-30: 413, 30-40: 363, 40-50: 366, 50-60: 294, 60-70: 301, 70-80: 253, 80-90: 212] What can be deduced from these readings?
Athat radioactivity is random and that the half-life is 90 minutes
Bthat radioactivity is random and that the half-life is uncertain
Cthat radioactivity is spontaneous and that the half-life is 90 minutes
Dthat radioactivity is spontaneous and that the half-life is uncertain
✓ Correct answer
B: that radioactivity is random and that the half-life is uncertain
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