Silicon is used in A. Solar energy devices B. Semiconductors C. Transistors D. All of these

Silicon is used in solar energy devices, semiconductors, and transistors.

• Solar energy devices use silicon to convert sunlight into electricity.
• Semiconductors are materials that conduct electricity under certain conditions. Silicon is a type of semiconductor that is used in many electronic devices, such as computers, cell phones, and televisions.
• Transistors are electronic devices that can be used to amplify or switch electronic signals. Silicon is a type of semiconductor that is used in most transistors.

In conclusion, silicon is a versatile material that is used in a variety of applications, including solar energy devices, semiconductors, and transistors.