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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
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20.3 | Radioactivity and Half-Life |
1. Calculate the kinetic energy (in electronvolts, eV) of an alpha particle emitted during a radioactive decay if it leaves the parent nucleus at 16 000 km/s. Take the mass of proton and neutron as mp = 1.6726 × 10-27 kg and mn = 1.6749 × 10-27 kg respectively. (1 eV = 1.6 × 10-19 J)
Correct Answer: D
2. What is the number of radioactive Radon-220 nuclei still undecayed after two minutes in a sample if initially there were 240 nuclei in the sample?
Correct Answer: A
3. What is the actual decay rate to the nearest whole number (in nuclei/year) of a Carbon-14 sample that contains 920 000 nuclei?
Correct Answer: B
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