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1. The half-life of a certain radioactive element is 67.0 hours. How much would be left after 335.0 h if the original sample was 1.000 mg?
0.031 mg 0.310 mg 0.062 mg 0.016 mg None of these

2. What is the result when Uranium-239 undergoes beta-particle emission, and then undergoes beta particle emission again?
232/90 Th 236/90 Th 235/94 Pu 239/94 Pu None of these

3. An alpha particle is a (blank) nucleus.
Hydrogen Helium Oxygen Carbon None of the Above

4. 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

5. Which is an impossible isotope of oxygen?
Fusion Beta particle emission nuclear transformation nuclear fission none of these


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