Physics · Dawn of Modern Physics

The speed of photons in a vacuum is greater than in liquid water.

In a vacuum, such as outer space, photons travel at the speed of light, which is approximately 299,792,458 meters per second (or about 186,282 miles per second).

In contrast, the speed of light in a material medium like liquid water is slightly slower than its speed in a vacuum due to interactions between the photons and the atoms or molecules of the medium. In water, the speed of light is approximately 225,000,000 meters per second (about 3/4 of its speed in a vacuum).

This difference in speed is due to the refractive index of the medium, which quantifies how much light is slowed down when it passes through the material compared to a vacuum.

The speed of photons in vacuum is greater than in liquid water.

In a vacuum, such as outer space, photons travel at the speed of light, which is approximately 299,792,458 meters per second (or about 186,282 miles per second).

In contrast, the speed of light in a material medium like liquid water is slightly slower than its speed in a vacuum due to interactions between the photons and the atoms or molecules of the medium. In water, the speed of light is approximately 225,000,000 meters per second (about 3/4 of its speed in a vacuum).

This difference in speed is due to the refractive index of the medium, which quantifies how much light is slowed down when it passes through the material compared to a vacuum.

This option is incorrect.Smaller: This is incorrect as the speed of photons decreases, not increases, when moving from a vacuum to liquid water.

This option is incorrect. Equal: This is incorrect because the speed of photons is only equal in a vacuum. In any other medium, their speed is reduced.

This option is incorrect. None of these options is correct: This is incorrect as 'Higher' accurately describes the relationship between the speed of photons in a vacuum versus liquid water.