Question

Relations between the speed of X-ray, gamma-ray, and UV rays when they travel in a vacuum.

• A. X-rays travel faster than UV rays and gamma rays.
• B. Gamma-rays travel faster than UV rays and X-rays.
• C. UV rays travel faster than X-rays and gamma rays.
• D. All of them travel at the same speed.

Hint:

Remember that the speed of light in a vacuum is constant for all electromagnetic waves, regardless of their frequency or wavelength.

Answer 1

The Correct Option is D

In a vacuum, all electromagnetic waves, including X-rays, gamma rays, and UV rays, travel at the same speed. This is the speed of light, denoted by \( c \), which is approximately \( 3 \times 10^8 \, \text{m/s} \).

1. Step 1: Speed of electromagnetic waves in a vacuum: All forms of electromagnetic radiation, including X-rays, gamma rays, and UV rays, travel at the speed of light in a vacuum. Thus, the correct answer is that all of them travel at the same speed.