ESS
Grade-9
Easy
Question
Select the INCORRECT characteristic of nuclear fusion.
- Fusion of hydrogen creates helium.
- Fusion occurs at high temperatures because energy is required to overcome the Coulomb barrier between atomic nuclei.
- Decay of Uranium 235 take place by nuclear fusion.
- Fusion creates many elements heavier than helium in stars.
The correct answer is: Decay of Uranium 235 take place by nuclear fusion.
Deuterium (D) and tritium (T), the heavy isotopes of hydrogen, react with one another, and when they fuse, they produce Helium. Uranium-235 makes up the bulk of the initial stage of nuclear fusion. Successive fusion reactions of helium nuclei create elements with even numbers of protons and neutrons up to magnesium and then up to calcium.
Hence, (B) is the right answer.
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