PH-2116
Radioactive decay
Physics · Secondary 4 · Hard · Radioactive decay
A GM tube is used to measure radiation from a source. Four readings of the count in one minute are: 152, 167, 160 and 171 counts. All readings are taken at the same distance. Why are the readings different?
- Because radioactive decay is random
- Because the half-life changes every minute
- Because the detector becomes more sensitive each time
- Because background radiation is completely absent
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