Question

Has been successfully used to generate energy
6.
Has NOT been successfully used to generate energy/electricity:
Has NOT been successfully used to generate energy/electricity

a.Fission
b.Fusion

Answer 1

To clarify the status of both fission and fusion in terms of energy generation:

a. **Fission**: This process has been successfully used to generate energy/electricity for many decades. Nuclear fission occurs when the nucleus of an atom splits into smaller parts, releasing a significant amount of energy. This process is utilized in nuclear power plants to produce electricity.

b. **Fusion**: As of now, nuclear fusion has not been successfully used to generate energy/electricity on a commercial scale. While fusion has been achieved in experimental settings (such as in hydrogen bombs and various laboratory experiments), sustained and controlled fusion for practical energy generation remains a major challenge and is still in the research and development phase.

So, to accurately categorize:

- **Has been successfully used to generate energy/electricity**: **a. Fission**
- **Has NOT been successfully used to generate energy/electricity**: **b. Fusion**