Which of the following waves have the maximum wavelength?

Options

A. X-rays
B. IR-rays
C. UV-rays
D. Radio waves

Answer

To determine which of the following waves has the maximum wavelength, we can analyze the electromagnetic spectrum. The electromagnetic spectrum consists of various types of waves arranged in order of increasing frequency and energy. The types of waves, in order from lowest frequency (longest wavelength) to highest frequency (shortest wavelength), are as follows:

1. Radio waves
2. Microwaves
3. Infrared waves
4. Visible light
5. Ultraviolet (UV) rays
6. X-rays
7. Gamma rays
8. Cosmic rays

### Step-by-step Solution:

1. **Understanding the Electromagnetic Spectrum**:
- The electromagnetic spectrum includes various types of waves, each with different wavelengths and frequencies. As we move from radio waves to gamma rays, the frequency increases while the wavelength decreases.

2. **Identifying the Order of Wavelengths**:
- From the spectrum, we can observe that radio waves have the longest wavelengths, followed by microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, which have the shortest wavelengths.

3. **Determining Maximum Wavelength**:
- Since we are looking for the wave with the maximum wavelength, we can conclude that radio waves, being the first in the spectrum, possess the longest wavelength compared to all other types of electromagnetic waves.

4. **Conclusion**:
- Therefore, the wave with the maximum wavelength is the radio wave.

### Final Answer:
The wave with the maximum wavelength is **radio waves**.

---