Which type of wave travels faster through water than through air?

Radio waves are electromagnetic waves that travel at the speed of light in a vacuum, which is approximately 299,792 kilometers per second. While they can travel through different media, their speed is not significantly increased in water compared to air; in fact, they generally slow down in denser media. Therefore, radio waves do not meet the criteria of traveling faster through water than through air.

Gamma waves are also electromagnetic waves and, like radio waves, travel at the speed of light in a vacuum. Their speed is similarly reduced in water compared to air, and they do not exhibit increased speed in denser media like sound waves do. Therefore, gamma waves do not fulfill the criteria of traveling faster through water than air.

Visible light waves, another form of electromagnetic radiation, travel slower in water than in air due to the refractive index of water being higher than that of air. This means that while light can pass through water, it does so at a reduced speed compared to its speed in air, thus failing to meet the question's requirement.