Energy is released in both nuclear fission and fusion because:
- The total mass before and after the reaction remains the same.
- The mass of the products is less than the mass of the reactants.
- Energy is not related to mass change.
- Both reactions involve a change in atomic number.
The Correct Option is B
Solution and Explanation
To solve the problem, we need to analyze the reason behind energy release in nuclear fission and fusion based on the options provided.
1. Understanding Mass-Energy Relationship in Nuclear Reactions:
- Nuclear reactions involve changes in the nucleus of atoms.
- According to Einstein’s equation, \( E = mc^2 \), mass can be converted into energy.
- The difference in mass before and after the reaction is called the mass defect, which is released as energy.
2. Analyze the Options:
- Option 1: "The total mass before and after the reaction remains the same." - This is false, as some mass is lost and converted to energy.
- Option 2: "The mass of the products is less than the mass of the reactants." - This is true; the mass defect is converted to energy, causing energy release.
- Option 3: "Energy is not related to mass change." - False, energy release is directly related to mass change.
- Option 4: "Both reactions involve a change in atomic number." - Not necessarily true for all cases, and this is not the primary reason energy is released.
Final Answer:
Energy is released in both nuclear fission and fusion because the mass of the products is less than the mass of the reactants.
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