Q105
General SciencePhysics
The energy radiated by the Sun is because of
- a.nuclear fusion.
- b.nuclear fission.
- c.radioactive decay.
- d.photo-electric effect.
Answer: (A) nuclear fusion.
The Sun generates energy through nuclear fusion — specifically the proton-proton chain reaction in which four hydrogen nuclei (protons) are fused to form one helium nucleus, releasing enormous energy (about 3.8 × 10²⁶ W). Nuclear fission is the splitting of heavy nuclei (used in nuclear reactors).