Describe very briefly any four regions of electromagnetic spectrum mentioning their special properties/features.

Explanation

**Step-by-Step Solution:**

1. **Gamma Rays:**
- **Wavelength:** Less than \(10^{-12}\) meters.
- **Properties/Features:** Gamma rays have the highest energy and shortest wavelength in the electromagnetic spectrum. They are highly penetrating and can pass through most materials, making them useful in medical applications such as cancer treatment and imaging.

2. **X-Rays:**
- **Wavelength:** Ranges from 1 nanometer (nm) to 1 picometer (pm).
...