Question

Which of the following are not electromagnetic waves?

• A. Cosmic rays
• B. Gamma rays
• C. \( \beta \)-rays
• D. X-rays

Hint:

Electromagnetic waves include a wide spectrum such as gamma rays, X-rays, and light, but \( \beta \)-rays are particles, not waves.

Answer 1

The Correct Option is C

Step 1: Identify the nature of electromagnetic waves.
Electromagnetic waves include gamma rays, X-rays, and cosmic rays. However, \( \beta \)-rays are not electromagnetic waves; they are high-energy electrons emitted from radioactive decay.
Step 2: Conclusion.
Thus, \( \beta \)-rays are not electromagnetic waves.
Final Answer: \[ \boxed{\beta \text{-rays}} \]