Which of the following radiation form the part of electromagnetic spectrum

Options

A. Alpha rays
B. Beta rays
C. Cathode rays
D. Gamma rays

Explanation

To determine which of the following radiations form part of the electromagnetic spectrum, we need to analyze each option provided. The electromagnetic spectrum includes various types of electromagnetic waves, characterized by oscillating electric and magnetic fields that are perpendicular to each other.

### Step-by-Step Solution:

1. **Understanding the Electromagnetic Spectrum**:
- The electromagnetic spectrum consists of waves that include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. These waves are characterized by oscillating electric and magnetic fields.

2. **Analyzing Alpha Rays**:
- Alpha rays consist of helium nuclei (two protons and two neutrons). They are particles, not waves, and do not involve oscillating electric and magnetic fields. Therefore, alpha rays do not form part of the electromagnetic spectrum.

3. **Analyzing Beta Rays**:
- Beta rays are high-speed electrons or positrons. Like alpha rays, they are also particles and do not consist of oscillating electric and magnetic fields. Thus, beta rays do not belong to the electromagnetic spectrum.

4. **Analyzing Cathode Rays**:
- Cathode rays are streams of electrons emitted from a cathode in a vacuum tube. They are also particles and do not exhibit the properties of electromagnetic waves. Therefore, cathode rays are not part of the electromagnetic spectrum.

5. **Analyzing Gamma Rays**:
- Gamma rays are a form of electromagnetic radiation. They are produced by the decay of atomic nuclei and consist of high-energy photons. Gamma rays do have oscillating electric and magnetic fields, making them a part of the electromagnetic spectrum.

6. **Conclusion**:
- Among the options provided, only gamma rays are part of the electromagnetic spectrum. Alpha rays, beta rays, and cathode rays are all forms of particle radiation and do not belong to the electromagnetic spectrum.

### Final Answer:
**Gamma rays are the only radiation from the options provided that form part of the electromagnetic spectrum.**

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