Question #6
2006
📝 Question
Energy of the Sun arises out of:
❓ Options
A
Thermonuclear reactions
✓ Correct Answer
B
Nuclear fission reactions
C
Radioactive decay
D
Pu²⁹ present in its atmosphere
💡 Explanation
- The Sun's energy is produced by thermonuclear reactions, specifically nuclear fusion.
- Nuclear fission reactions are not the source of the Sun's energy.
- Radioactive decay is not a significant source of solar energy.
- Pu²⁹ (Plutonium239) is not related to solar energy production.
📌 Key Points:
Note:
Nuclear Fusion:
- Fusion is the process where two lighter atomic nuclei combine to form a heavier nucleus.
- It occurs naturally in stars like the Sun, where hydrogen atoms fuse to form helium.
- Fusion releases an enormous amount of energy, more than fission, due to the merging of light nuclei.
- Fusion requires extremely high temperatures and pressure to overcome the repulsive forces between nuclei.
- It is considered a clean source of energy as it produces minimal radioactive waste compared to fission.
- Scientists are working on controlled fusion for energy production, with projects like ITER (International Thermonuclear Experimental Reactor).
Nuclear Fission:
- Fission is the process in which a heavy atomic nucleus splits into two or more smaller nuclei, along with neutrons and energy release.
- It occurs in nuclear reactors and atomic bombs, where elements like uranium235 or plutonium239 are used.
- Fission releases a significant amount of energy, which is harnessed in nuclear power plants for electricity.
- The process also produces radioactive waste, which needs careful management.
- Fission can be triggered by bombarding the heavy nucleus with neutrons, leading to a chain reaction where more neutrons are produced, sustaining the reaction.
Both fusion and fission involve changes in the nucleus of atoms and release energy, but fusion combines lighter elements while fission splits heavier elements.