Uranium-235 decays to thoriun+ 234 by the process of
Correct answer: C. alpha radiation
- A. fission
- B. beta decay
- C. alpha radiation
- D. gamma radiation
Explanation
URANIUM-238 : Mass number : 238 Atomic number : 92 THORIUM-234 : Mass number : 234 Atomic number: 90 From above, it is clear that mass number decreases by 4 and atomic number decreases by 2. That's exactly what happens in alpha decay so option 'C' is the right answer.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Radioactive Decay
Radioactive decay is the spontaneous transformation of unstable nuclei, described by decay constant, activity, half life and the exponential decay law. Work includes alpha, beta and gamma emissions, decay equations and remaining nuclei, with half life distinguished from the time required for complete decay.
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