Name the parts of the electromagnetic spectrum which is
used to treat muscular strain.
Write in brief, how these waves can be produced.

Explanation

**Step-by-Step Solution:**

1. **Identify the Part of the Electromagnetic Spectrum:**
- The part of the electromagnetic spectrum used to treat muscular strain is **Infrared waves**.

2. **Understanding Infrared Waves:**
- Infrared waves are a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. They are commonly used in therapeutic applications, particularly for muscle and joint pain relief.

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