The radiation having the least wavelength out of the following options is

Options

A. `gamma` - rays
B. `beta` - rays
C. `alpha` - rays
D. X - rays

Answer

To solve the question regarding which radiation has the least wavelength among the options provided, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Electromagnetic Spectrum**:
The electromagnetic spectrum consists of various types of radiation arranged in order of increasing frequency and decreasing wavelength. The order from longest wavelength to shortest wavelength is:
- Radio Waves
- Microwaves
- Infrared
- Visible Light
- Ultraviolet
- X-rays
- Gamma Rays

2. **Identify the Wavelength Trend**:
As we move from radio waves to gamma rays, the wavelength decreases while the frequency increases. Thus, gamma rays have the shortest wavelength.

3. **List the Types of Radiation**:
If the options provided in the question include types of radiation such as:
- Radio Waves
- Microwaves
- Infrared
- Visible Light
- Ultraviolet
- X-rays
- Gamma Rays

4. **Determine the Radiation with the Least Wavelength**:
From the list, gamma rays are known to have the least wavelength. Therefore, among the options provided, the radiation with the least wavelength is gamma rays.

5. **Select the Correct Option**:
If gamma rays are one of the options, then the correct answer is the option that represents gamma rays.

### Final Answer:
The radiation having the least wavelength out of the following options is **Gamma Rays**.

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