Nuclear fusion in the Sun releases energy by converting
Correct answer: B. hydrogen into helium
- A. uranium into lead
- B. hydrogen into helium
- C. helium into hydrogen
- D. carbon into oxygen
Explanation
Four hydrogen nuclei combine through the proton proton chain to give one helium nucleus, and the small mass difference appears as energy. Enormous temperature and pressure are needed to overcome the electrostatic repulsion between the positively charged nuclei, which is why sustained fusion is so hard to achieve on Earth. Fusion releases more energy per kilogram of fuel than fission and leaves far less long lived waste.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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