UV rays have wavelength ............. that of IR rays.

Options

A. equal to
B. larger than
C. smaller than
D. none of these

Explanation

To solve the question "UV rays have wavelength ............. that of IR rays," we need to compare the wavelengths of ultraviolet (UV) rays and infrared (IR) rays.

### Step-by-Step Solution:

1. **Understand the Electromagnetic Spectrum**:
The electromagnetic spectrum is a range of all types of electromagnetic radiation. It includes various types of waves such as gamma rays, X-rays, ultraviolet rays, visible light, infrared rays, microwaves, and radio waves.

2. **Identify the Position of UV and IR Rays**:
In the electromagnetic spectrum, UV rays are located to the left of IR rays. This means that UV rays have shorter wavelengths compared to IR rays.

3. **Recall the Relationship Between Wavelength and Frequency**:
In the electromagnetic spectrum, as you move from left to right, the wavelength increases while the frequency decreases. Therefore, UV rays, being to the left of IR rays, have a shorter wavelength.

4. **Compare the Wavelengths**:
Since UV rays are positioned before IR rays in the spectrum, we can conclude that the wavelength of UV rays is smaller than that of IR rays.

5. **Fill in the Blank**:
Based on the comparison, we can fill in the blank in the question: "UV rays have wavelength smaller than that of IR rays."

### Final Answer:
UV rays have wavelength **smaller than** that of IR rays.