Question

Which of the following is not an electromagnetic wave?

• A. Alpha rays
• B. Gamma rays
• C. Infrared rays
• D. X-rays

Hint:

Electromagnetic waves are characterized by oscillating electric and magnetic fields, and include visible light, gamma rays, X-rays, and infrared rays.

Answer 1

The Correct Option is A

Step 1: Understanding electromagnetic waves.
Electromagnetic waves include visible light, radio waves, X-rays, gamma rays, and infrared rays. They all travel at the speed of light in a vacuum and can propagate through a vacuum.
Step 2: Elimination of options.
- (A) Alpha rays: Alpha rays are not electromagnetic waves. They are a form of particle radiation consisting of helium nuclei.
- (B) Gamma rays: Gamma rays are electromagnetic waves with high energy.
- (C) Infrared rays: Infrared rays are electromagnetic waves that are used for heat and communication.
- (D) X-rays: X-rays are also electromagnetic waves.
Conclusion: Alpha rays are not an electromagnetic wave.