**Category:** Electromagnetism  
**Subtype:** Electromagnetic Spectrum  
**Problem Description:** Identify the region of the electromagnetic spectrum for a given frequency range.

**Summary:** The problem provides a frequency range of electromagnetic waves in a vacuum, from \(2 \times 10^{13} \, \text{Hz}\) to \(8 \times 10^{13} \, \text{Hz}\), and asks to determine which part of the electromagnetic spectrum this range falls into, given the speed of light in a vacuum is \(3 \times 10^{8} \, \text{m/s}\). The options include X-rays, ultraviolet, infrared, and visible light.