PH-2107
Radioactive decay
Physics · Secondary 4 · Medium · Radioactive decay
A GM tube is used to measure radiation from a source. Four readings of the count in one minute are: 512, 498, 525 and 507 counts. Why are the readings different?
- The half-life of the source is changing
- The GM tube becomes more sensitive each time
- Radioactive decay is a random process
- Background radiation suddenly stops and starts
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