State the nature of infrared and `gamma`-rays. How do they differ in their (i) wavelength, and (ii) penetrating power ?

Explanation

### Step-by-Step Solution:

1. **Nature of Infrared and Gamma Rays**:
- Both infrared rays and gamma rays are forms of electromagnetic radiation. They travel through space as waves and consist of photons, which are packets of energy. Both types of rays are uncharged and can propagate through a vacuum.

2. **Comparison of Wavelength**:
- The wavelength of electromagnetic waves varies across the spectrum. Gamma rays have a much shorter wavelength compared to infrared rays.
- Mathematically, we can express this as:
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