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1. You are given a substance, X. The weight is 8.227 grams. The half-life of substance X is 16.5 hours. How much did X weight 5 days ago?
635 grams 1270 grams 1720 grams 860 grams None of these

2. If a nucleus is said to have a low probability of undergoing decomposition, it said to have:
high kinetic stability low beta emission rate low gamma ray emission rate high thermodynamic stability high gamma ray emission rate

3. Gamma rays have:
0 protons, 1 neutron, 1 electron 0 protons, 0 neutrons, 0 electrons 1 proton, 0 neutrons, 1 electron 1 proton, 1 neutron, 1 electron None of these

4. Which is NOT an example of an isotope?
14/6 C 232/90 Th 0/-1 e 235/92 U All of these are isotopes

5. You are given 1.54 grams of a substance. After6 days, 0.38 grams remain. What is the half-life of this substance?
71.3 hours 35.8 hours 29.4 hours 192 hours None of these

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