Generation, propagation and detection of electromagnetic waves is the basis of

Options

A. lasers
B. reactors
C. radio and television
D. computer

Explanation

To solve the question regarding the generation, propagation, and detection of electromagnetic waves, we will analyze each option provided and determine which one is based on these principles.

### Step-by-Step Solution:

1. **Understanding Electromagnetic Waves**:
- Electromagnetic waves are waves that can travel through the vacuum of space and are characterized by oscillating electric and magnetic fields. They are fundamental to various technologies, including communication systems.

2. **Analyzing Option A: Lasers**:
- Lasers stand for "Light Amplification by Stimulated Emission of Radiation." While lasers do involve light and can emit electromagnetic radiation, they primarily focus on the amplification of light rather than the generation, propagation, and detection of electromagnetic waves in a broader sense.
- **Conclusion**: Incorrect.

3. **Analyzing Option B: Reactors**:
- Reactors, particularly nuclear reactors, are based on nuclear fission processes. They do not fundamentally rely on electromagnetic waves for their operation.
- **Conclusion**: Incorrect.

4. **Analyzing Option C: Radio and Television**:
- Radio and television technology is fundamentally based on the transmission and reception of electromagnetic waves. They use these waves to carry signals over distances without the need for physical connections (wires).
- **Conclusion**: Correct.

5. **Analyzing Option D: Computers**:
- Computers operate using digital circuits and semiconductor technology. While they do use electromagnetic signals for data transfer, their primary operation is not based on the generation and propagation of electromagnetic waves in the same way that radio and television are.
- **Conclusion**: Incorrect.

6. **Final Conclusion**:
- After analyzing all options, the only one that is fundamentally based on the generation, propagation, and detection of electromagnetic waves is **Option C: Radio and Television**.

### Final Answer:
The correct answer is **Option C: Radio and Television**.

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