No, gamma rays do not travel faster than visible light. In a vacuum, all forms of electromagnetic radiation, including gamma rays and visible light, travel at the same speed, which is the speed of light in a vacuum, denoted as "c." The value of the speed of light in a vacuum is approximately 299,792,458 meters per second or about 186,282 miles per second.
According to the theory of special relativity developed by Albert Einstein, the speed of light in a vacuum is the maximum speed at which any form of energy or information can travel. Therefore, gamma rays, visible light, radio waves, X-rays, and all other forms of electromagnetic radiation all travel at the same speed in a vacuum.
It's important to note that when electromagnetic radiation passes through a medium other than a vacuum, such as air or water, its speed may change due to interactions with the atoms or molecules in the medium. However, in a vacuum, all forms of electromagnetic radiation, including gamma rays and visible light, travel at the same speed.