The E.M. wave with shortest wavelength among following is

Options

A. ultraviolet rays
B. `X` rays
C. `gamma` rays
D. microwaves

Answer

To determine which electromagnetic (E.M.) wave has the shortest wavelength among the given options (ultraviolet, X-rays, gamma rays, and microwaves), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Electromagnetic Spectrum**:
The electromagnetic spectrum is a range of all types of electromagnetic radiation, which varies in wavelength and frequency. The spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

2. **Identify the Order of Wavelengths**:
The order of the electromagnetic spectrum from longest wavelength to shortest wavelength is as follows:
- Radio Waves
- Microwaves
- Infrared
- Visible Light
- Ultraviolet
- X-rays
- Gamma Rays

3. **Locate the Given Options**:
From the options provided:
- Ultraviolet (UV) radiation
- X-rays
- Gamma rays
- Microwaves

4. **Compare the Wavelengths**:
- **Microwaves** have longer wavelengths than UV, X-rays, and gamma rays.
- **Ultraviolet** has shorter wavelengths than microwaves but longer than X-rays and gamma rays.
- **X-rays** have shorter wavelengths than both ultraviolet and microwaves but longer than gamma rays.
- **Gamma rays** have the shortest wavelengths in the electromagnetic spectrum.

5. **Conclusion**:
Based on the order of wavelengths, gamma rays have the shortest wavelength among the options provided.

### Final Answer:
The E.M. wave with the shortest wavelength among the following is **Gamma rays**.

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