Which type of radiation in the electromagnetic spectrum has the longest wavelength?

• A. Ultraviolet radiation
• B. Radio waves
• C. X-rays
• D. Gamma rays

Answer: (B)

Verified step by step guidance

1. Recall that the electromagnetic spectrum consists of different types of radiation arranged by wavelength and frequency.
2. Understand that wavelength and frequency are inversely related by the equation \(\lambda = \frac{c}{\nu}\), where \(\lambda\) is wavelength, \(c\) is the speed of light, and \(\nu\) is frequency.
3. Identify the types of radiation given: Ultraviolet, Radio waves, X-rays, and Gamma rays, and know their relative positions on the electromagnetic spectrum.
4. Recognize that radio waves have the lowest frequency and therefore the longest wavelength among the options provided.
5. Conclude that radio waves have the longest wavelength compared to ultraviolet, X-rays, and gamma rays.