Discussion
Which of the following statements is incorrect ?
Answer: B
The incorrect statement is (b), that in fusion the products are not lighter than the starting nuclei.
In both fission and fusion, the total mass of the products is less than the mass of the reacting nuclei. The missing mass, the mass defect, is released as energy according to \(E = mc^{2}\). That is precisely why both reactions give out energy; in fusion the mass defect per unit mass of fuel is even larger.
The other statements are correct: geothermal energy is tapped by drilling wells to bring up steam or hot water; biomass stores solar energy captured by photosynthesis; and wind power works best where winds are strong and steady, as on islands, coasts and mountain passes.
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