Radiation below the visible range are called

Options

A. UV
B. IR
C. both 1 and 2
D. radiowaves

Answer

To answer the question "Radiation below the visible range are called", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Electromagnetic Spectrum**: The electromagnetic spectrum consists of various types of radiation, which are categorized based on their wavelengths. These include gamma rays, X-rays, ultraviolet (UV) rays, visible light, infrared (IR) rays, microwaves, and radio waves.

2. **Identifying the Visible Range**: The visible range of light is the portion of the electromagnetic spectrum that is visible to the human eye. This range typically spans wavelengths from approximately 380 nanometers (nm) to 700 nm.

3. **Determining Radiation Below the Visible Range**:
- **Infrared (IR) Radiation**: This type of radiation has wavelengths longer than visible light, typically from about 700 nm to 1 mm. Therefore, it is above the visible range.
- **Ultraviolet (UV) Radiation**: This radiation has wavelengths shorter than visible light, ranging from about 100 nm to 400 nm. Therefore, it is below the visible range.

4. **Analyzing the Options**:
- Option 1: UV (Ultraviolet) - Correct, as it is below the visible range.
- Option 2: IR (Infrared) - Incorrect, as it is above the visible range.
- Option 3: Both 1 and 2 - Incorrect, since only UV is below the visible range.
- Option 4: Radio waves - Incorrect, as they have much longer wavelengths than visible light.

5. **Conclusion**: Based on the analysis, the correct answer to the question is **Option 1: UV (Ultraviolet) radiation**.