**Category:** Electromagnetism  
**Subtype:** Wave properties of electromagnetic waves  
**Problem Description:** This problem is about finding the wavelength (\(\lambda\)) of an electromagnetic wave given its frequency (\(f\)) and the speed of light in a vacuum (\(c\)).  

**Key Concept:** The relationship between wavelength, frequency, and speed of a wave is described by the equation \(\lambda = \frac{c}{f}\).  

**Options to Evaluate:**  
A. \(\lambda=\frac{2 \pi c}{f}\)  
B. \(\lambda=\frac{2 \pi f}{c}\)  
C. \(\lambda=\frac{f}{c}\)  
D. \(\lambda=\frac{c}{f}\)  

**Goal:** Identify the correct formula for the wavelength of the electromagnetic wave.