Question

How does the speed of visible light compare with the speed of gamma rays, when both speeds are in a vacuum?

Answer 1

Yes. The Gamma rays ( γ- Rays) are also part of the vast EM radiation, so they also travels with the speed of Light c (`3 x 10^8 m/s`). (https://www.quora.com/Do-gamma-rays-travel-as-fast-as-the-speed-of-light)

Explanation:

If you search your question on the Internet, you find your answer here:
https://www.quora.com/Do-gamma-rays-travel-as-fast-as-the-speed-of-light