State two similarities and two dissimilarities between the `gamma`-rays and X-rays.

Explanation

**Step-by-Step Solution:**

1. **Identify Similarities:**
- **Similarity 1:** Both gamma rays and X-rays are electromagnetic waves (EM waves).
- **Similarity 2:** Both gamma rays and X-rays travel at the same speed in a vacuum, which is approximately \(3 \times 10^8\) meters per second.

2. **Identify Dissimilarities:**
- **Dissimilarity 1:** Gamma rays have a shorter wavelength compared to X-rays. This difference in wavelength places them at different positions in the electromagnetic spectrum.
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