Which type of electromagnetic waves has the longest wavelength?

• A. Gamma rays
• B. Ultraviolet waves
• C. Infrared waves
• D. Radio waves

Answer: (D)

Verified step by step guidance

1. Recall the electromagnetic spectrum, which arranges electromagnetic waves by their wavelength and frequency.
2. Understand that wavelength and frequency are inversely related by the equation \(\lambda = \frac{c}{f}\), where \(\lambda\) is wavelength, \(c\) is the speed of light, and \(f\) is frequency.
3. Identify the types of electromagnetic waves listed: Gamma rays, Ultraviolet waves, Infrared waves, and Radio waves.
4. Recognize that gamma rays have the shortest wavelengths and highest frequencies, while radio waves have the longest wavelengths and lowest frequencies.
5. Conclude that among the options given, radio waves have the longest wavelength.