To solve the problem, we need to identify which electromagnetic wave has the largest wavelength among the given options.
1. Electromagnetic Spectrum Overview:
The electromagnetic spectrum is arranged in order of increasing wavelength (and decreasing frequency) as follows:
Gamma rays < X-rays < Ultraviolet (UV) rays < Visible light < Infrared < Microwaves < Radio waves
2. Comparing the Options:
- Gamma rays: Very short wavelength (smallest)
- X-rays: Slightly longer than gamma rays
- UV rays: Longer than X-rays but still short
- Radio waves: Longest wavelength in the entire electromagnetic spectrum
Final Answer:
The electromagnetic wave with the largest wavelength is Radiowaves (Option D).